test(desktop): unit tests for main.rs's decisions and a browser test for the connect page

main.rs was the only source file without tests, and it held three decisions
with real failure modes:

- Which login a connect goes out with. The choice was a closure body inside
  the probe worker; it is now choose_login, tested for every row: typed wins,
  then the Keychain, then the local Codeman's own login, which is used only
  when no saved password was expected and only for the same username.
- What the Keychain keeps afterwards (update_keychain): saved or deleted by
  Remember, never a copy of the local server's login, never a password the
  server wants changed, and the old user's item deleted before the new save.
  The in-memory Keychain store moves out of credentials' test module so other
  test modules can use it.
- When a commit in the main window means the server page is loaded.

The connect page had only substring checks in the repository; the checks that
drove it lived in a scratch script. They are now
test/desktop-connect-page.browser.test.ts: Chromium, the page's real CSP, a
stubbed native side, five ordered walks through every state of both tabs
(first run, logins, failures, redirects, Start, the install wait, the SSH
install, layout, double clicks, keys, a starting server, a WebKit too old).
Listed in BROWSER_TEST_GLOBS, so the nightly browser suite runs it and
`npm test` does not.

Also pins the install one-liner the page shows to the one Copy copies.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.changeset/files-panel-live-worktree.md

@@ -1,5 +0,0 @@
----
-"aicodeman": patch
----
-
-Files panel: when a session's agent moves into a git worktree part way through (Claude Code's EnterWorktree), the panel now lists that worktree instead of the main checkout, follows the agent back out, and shows a strip that names the worktree with a button to switch to the session's folder. Only a worktree inside the session's folder is followed, and file access stays confined to that folder as before.

CLAUDE.md

@@ -238,8 +238,6 @@ The terminal provider scans `terminalLinkLine()`, which extends `terminalPathLin
 
 **Files panel search** (COD-236, the `q` param on `GET /api/sessions/:id/files`): `compileFileQuery()` (`utils/file-query.ts`, pure) compiles the query into a predicate the server-side walk prunes with; a query returns a FLAT match list and the walk recurses past non-matching directories. An empty, whitespace-only or overlong (`MAX_QUERY_LENGTH`, 256) query compiles to `null`, keeping the default tree response byte-identical. ⚠️ **Never compile a glob into a RegExp** (`*a*a*a…` backtracks and freezes the event loop for the whole server): `globMatch()` is a two-pointer wildcard walk. → [architecture-invariants#files-panel-search](docs/architecture-invariants.md#files-panel-search)
 
-**Files panel in a worktree** (#765, `src/live-worktree.ts`, `root=live` on `GET /api/sessions/:id/files`): Claude's EnterWorktree moves the process, and `paneCwd` follows it (tmux reads the process cwd, measured on 2.1.318, back out on ExitWorktree too), while `workingDir` stays the session's identity. `refreshLiveWorktree()` (server.ts) turns a changed `paneCwd` into `SessionState.liveWorktree` by reading the `.git` FILE (never spawning git), walking up and stopping at `workingDir`, a repository or submodule of its own, or anything unreadable. ⚠️ Only a folder strictly below `workingDir` is ever an answer, which is the whole security argument: the walk starts there, returned `path`s stay relative to `workingDir`, and the routes keep confining to `workingDir`, so never make `liveWorktree` a confinement root (a worktree outside the folder stays unfollowed). ⚠️ A plain subfolder is deliberately no answer, or a `cd` in a shell would re-root the panel. ⚠️ A listing reports `worktree` whichever folder it walked, even when the worktree has gone: `_followFileBrowserWorktree()` compares that with the session's state, and an absent report would reload forever. Tests: `test/live-worktree.test.ts`, `test/routes/file-routes-live-worktree.test.ts`, `test/file-browser-worktree.test.ts`.
-
 **Git status indicator** (`showGitStatus`, per-device, default OFF; `src/git-workspace-status.ts`, `routes/git-status-routes.ts`, `git-status-ui.js`): the bottom-bar indicator and its panel read `GET /api/sessions/:id/git-status` and `/git-diff`, read-only and offline on its own (it never fetches; fetching is the separate path below). ⚠️ git never runs on a repository at or inside a Docker case workspace (walk-up, scan and diff alike, and a cached repository list is re-checked against the CURRENT Docker roots), since a container could plant a clean filter that runs on the host; remote and Docker sessions answer `unsupported`. ⚠️ `git-diff` takes `repo`/`path`/`kind` only as keys matched against the workspace's own repository list (`findWorkspaceRepo()`) and that repository's current status, never as paths. ⚠️ Keep `--no-optional-locks`, `core.fsmonitor=false` and `log.showSignature=false` on every call and `--no-ext-diff --no-textconv` on diffs; clean filters still run, which is why the Docker rule exists. ⚠️ An enclosing repository at `$HOME` or above is ignored (`isUnrelatedAncestor()`), and is identified by one cached `rev-parse` before any full status runs. Everything git supplies renders via `textContent`. Tests: `test/git-workspace-status.test.ts`, `test/routes/git-status-routes.test.ts`, and `test/git-status.browser.test.ts` (browser suite, not in the gate).
 
 **Git fetch** (`src/git-fetch.ts`, `src/git-fetch-scheduler.ts`, `routes/git-status-routes.ts`, the panel's **Fetch** button): `POST /api/sessions/:id/git-fetch` is the ONLY git command the Git PANEL runs that WRITES (cloning and worktree management write too, but only when the user asked for them at that moment), and it is the only one that can run later by itself, on a timer, and the only one that can run a repository's own hooks (`reference-transaction`, `pre-auto-gc` through the automatic maintenance a fetch triggers, config commands such as `credential.helper`), which is why it is opt-in and never runs on a timer until the user turns it on. ⚠️ Fetch updates remote-tracking refs only; it must never commit, check out, merge or touch the working tree. ⚠️ It is not as harmless as a read: a fetch holds git's ref lock, so an agent's own `git pull` in the same clone can hit the same `cannot lock ref`, hence one folder is fetched by at most one run at a time (`fetchWorkspaceOnce` joins a run already going), and `FETCH_CONFIG_ARGS` (`-c core.fsmonitor=false -c maintenance.auto=false -c gc.auto=0`) keeps an unattended fetch from starting a gc in a repository the agent is using. ⚠️ `buildFetchArgs()` is `['fetch', '--quiet']` and must stay verb-invariant (`test/git-fetch.test.ts`); those `-c` overrides are added by the runner, not by `buildFetchArgs()`. ⚠️ The git timeout must reach the whole process TREE, not just the `git` parent: `execFile` signals the parent only, so `runFetch` spawns `detached` and signals the negative pid (SIGTERM, then SIGKILL `FETCH_KILL_ESCALATION_MS` later), and the caller is answered AT the timeout while the group is still dying: that is the point. `test/git-fetch.test.ts` proves it against a local server that never answers, by group membership rather than parentage. A non-zero exit must still reject the way `execFile` would, or a real failure reads as a clean run with no reason. ⚠️ The same Docker rule as above applies BEFORE any git runs (a repository at or inside a Docker case workspace is refused), and remote sessions answer `unsupported`. ⚠️ Keep it non-interactive (`gitNonInteractiveEnv()`: `GIT_TERMINAL_PROMPT=0` + BatchMode ssh) or a fetch hangs on an invisible login prompt, but that BatchMode ssh is a DEFAULT, never an override: `fetchEnvFor` must not overwrite the repository's `core.sshCommand`, the user's own `GIT_SSH_COMMAND` or a `GIT_SSH` (`readRepoSshCommand` reads it inside the same limiter slot and the same wall-clock bound as the fetch it serves, and the spawn gets only what the read left), and `StrictHostKeyChecking=accept-new` writes an unknown host key into `~/.ssh/known_hosts` without asking: BatchMode stops a prompt, not a write. Keep it bounded: `MAX_REPOS`/`MAX_REPOS_LIMIT` (12/50), `MAX_FETCH_OUTPUT_BYTES` (2 MB), the git timeout per spawn, and `FETCH_CONCURRENCY` (4) as ONE `Limiter` shared by the fetches of the whole tick: `createLimiter` keeps its count in the closure, so a limiter that delegated to `mapLimited` per call bounds each call, and 4 folders × 4 repositories would start 16 git processes. ⚠️ One semaphore cannot bound both the folders and the fetches: a folder holding a slot would then wait for a slot its own fetch needs, so the tick bounds its folders with `mapLimited` and hands the shared bound to every run. ⚠️ Failure text reaching a client is control-stripped and credential-redacted (`sanitizeGitOutput`) and the browser writes it with `textContent`. Scheduler semantics: settings are read fresh each tick (`GIT_FETCH_TICK_INTERVAL_MS`, 15 s), a per-session override wins even while the app-wide switch is off, the interval is timed from the run START, state is keyed by FOLDER (sessions sharing one folder are the same clone, so one run serves them all, the schedule is stamped at selection, and every session on a folder is remembered, a folder is due when ANY session open on it is due, so the order the sessions were read cannot decide which interval wins (both orders are tested), and the folder is probed once for the whole group rather than once per session on it: closing the one that holds the override must not stop the folder's fetching while another session is still open on it), a tick is skipped while the previous one is still going, and a user-chosen folder is probed BOUNDED with the default options before anything runs (rule #516: `unknown` is never read as `absent`). ⚠️ The two settings (`gitFetchEnabled`, `gitFetchIntervalSeconds`, off/300 by default, clamped 30–3600) are **synced**, not per-device: they must stay out of `displayKeys` and out of the strip destructure in settings-ui.js, or the scheduler reads nobody's value. Per-session state rides `SessionUpdated` (no new SSE event) as `gitFetch`, and the click route publishes the run's trigger, not the request's: `trigger: 'click'` only when the click was the run, because a click that joined a tick already going fetched nothing and cannot report itselLine truncated

config/test-suites.ts

@@ -60,6 +60,7 @@ export const BROWSER_TEST_GLOBS = [
   'test/fullscreen-tab-switch-capture.browser.test.ts',
   'test/terminal-touch-swipe-axis.browser.test.ts',
   'test/phone-press-feedback.browser.test.ts',
+  'test/desktop-connect-page.browser.test.ts', // no server: the page is served by request interception
 ];
 
 /**

docs/wiki/Git-Worktrees.md

@@ -39,19 +39,6 @@ name.
 
 **Open** on a worktree's row starts another session in it, with the CLI chosen above.
 
-## When an agent moves into a worktree
-
-Claude Code can move a running session into a worktree part way through (its EnterWorktree tool),
-and the session's tab stays on the case. While the session's pane is in a worktree inside the
-session's folder, the **Files** panel lists that worktree, so you see the files the agent is
-editing. A strip under the panel's title names the worktree, and its **Session folder** button
-switches to the session's own folder (**Back to worktree** returns). The panel follows the agent
-in and back out on its own while it is open.
-
-A worktree outside the session's folder (`git worktree add ../feature`) is not followed: Codeman
-only serves files inside the session's folder. Open such a worktree as a case of its own with
-Add Case > Link Existing.
-
 ## Removing one
 
 Two ways, and both use `git worktree remove` **without** `--force`:

docs/wiki/Working-With-Files.md

@@ -6,9 +6,8 @@ until you get home.
 
 ## The File Viewer
 
-A panel that browses the active session's working directory, or the git worktree its agent
-moved into ([Git Worktrees](Git-Worktrees#when-an-agent-moves-into-a-worktree)). Its header
-button is on by default; if it is missing, re-enable it in **App Settings → Header & Panels**.
+A panel that browses the active session's working directory. Its header button is on by
+default; if it is missing, re-enable it in **App Settings → Header & Panels**.
 
 It renders what it can:
 

package-lock.json

@@ -63,7 +63,7 @@
         "exceljs": "4.4.0",
         "fflate": "0.8.3",
         "pixelmatch": "^6.0.0",
-        "playwright": "^1.64.1",
+        "playwright": "^1.58.0",
         "pngjs": "^7.0.0",
         "postcss": "^8.5.15",
         "prettier": "^3.4.0",
@@ -9736,32 +9736,50 @@
       }
     },
     "node_modules/playwright": {
-      "version": "1.64.1",
-      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.64.1.tgz",
-      "integrity": "sha512-HCrVhHr5QQuwYoswEUGTb7gGp522yflbv/ST8nF4sFWGuLjQCt17Q/EubpGGSNKYn1tsTCPZxqHhHCfVURu7UA==",
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.60.0.tgz",
+      "integrity": "sha512-hheHdokM8cdqCb0lcE3s+zT4t4W+vvjpGxsZlDnikarzx8tSzMebh3UiFtgqwFwnTnjYQcsyMF8ei2mCO/tpeA==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "playwright-core": "1.64.1"
+        "playwright-core": "1.60.0"
       },
       "bin": {
         "playwright": "cli.js"
       },
       "engines": {
-        "node": ">=20"
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
       }
     },
     "node_modules/playwright-core": {
-      "version": "1.64.1",
-      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.64.1.tgz",
-      "integrity": "sha512-BC4s8y6SEVA6Q1rSxZTto8hI1KUI3xXlHGZgvGqP4IqPdI/a6FX9H29IDNz7vKo9l21b6LfYosScPL6M3xxyDQ==",
+      "version": "1.60.0",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.60.0.tgz",
+      "integrity": "sha512-9bW6zvX/m0lEbgTKJ6YppOKx8H3VOPBMOCFh2irXFOT4BbHgrx5hPjwJYLT40Lu+4qtD36qKc/Hn56StUW57IA==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
         "playwright-core": "cli.js"
       },
       "engines": {
-        "node": ">=20"
+        "node": ">=18"
+      }
+    },
+    "node_modules/playwright/node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
     "node_modules/pngjs": {

package.json

@@ -133,7 +133,7 @@
     "exceljs": "4.4.0",
     "fflate": "0.8.3",
     "pixelmatch": "^6.0.0",
-    "playwright": "^1.64.1",
+    "playwright": "^1.58.0",
     "pngjs": "^7.0.0",
     "postcss": "^8.5.15",
     "prettier": "^3.4.0",

packages/desktop/.gitignore

@@ -0,0 +1,2 @@
+target/
+dist/

packages/desktop/Cargo.toml

@@ -0,0 +1,87 @@
+[package]
+name = "codeman-desktop"
+version = "0.1.0"
+edition = "2021"
+rust-version = "1.90"
+description = "Codeman Desktop: a small native window for a Codeman server"
+license = "MIT"
+publish = false
+
+[[bin]]
+name = "codeman-desktop"
+path = "src/main.rs"
+
+[dependencies]
+# Window + event loop (tao), the system web view (wry: WKWebView on macOS,
+# WebView2 on Windows, WebKitGTK on Linux) and native menus (muda). Tauri is
+# built on these three; using them directly keeps the app small and gives us
+# `load_url_with_headers`, which Tauri's navigate() does not have (see README).
+tao = "0.37"
+wry = { version = "0.57", features = ["devtools"] }
+muda = "0.21"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+url = "2"
+base64 = "0.22"
+dirs = "6"
+# The reachability probe. platform-verifier = the OS trust store, the same one
+# WKWebView uses, so the probe and the window agree on which certificates pass.
+ureq = { version = "3", features = ["platform-verifier"] }
+
+[target.'cfg(target_os = "macos")'.dependencies]
+security-framework = "3"
+# JavaScript dialogs, HTTP Basic challenges, clearing cookies and the window's
+# content size (src/macos.rs). The versions wry already pulls in, so no new
+# crate is added.
+objc2 = { version = "0.6.5", default-features = false, features = ["std"] }
+block2 = { version = "0.6.2", default-features = false, features = ["std"] }
+objc2-foundation = { version = "0.3.2", default-features = false, features = [
+    "std",
+    "objc2-core-foundation",
+    "block2",
+    "NSDate",
+    "NSGeometry",
+    "NSObject",
+    "NSOperation",
+    "NSRange",
+    "NSSet",
+    "NSString",
+    "NSURL",
+    "NSURLAuthenticationChallenge",
+    "NSURLCredential",
+    "NSURLProtectionSpace",
+    "NSURLRequest",
+    "NSURLResponse",
+    "NSURLSession",
+] }
+objc2-app-kit = { version = "0.3.2", default-features = false, features = [
+    "std",
+    "objc2-core-foundation",
+    "NSAlert",
+    "NSApplication",
+    "NSButton",
+    "NSControl",
+    "NSResponder",
+    "NSTextField",
+    "NSView",
+    "NSWindow",
+] }
+objc2-web-kit = { version = "0.3.2", default-features = false, features = [
+    "std",
+    "block2",
+    "objc2-app-kit",
+    "WKFrameInfo",
+    "WKNavigationDelegate",
+    "WKSecurityOrigin",
+    "WKUIDelegate",
+    "WKWebView",
+    "WKWebsiteDataRecord",
+    "WKWebsiteDataStore",
+] }
+
+[profile.release]
+opt-level = "s"
+lto = true
+codegen-units = 1
+strip = true
+panic = "abort"

packages/desktop/README.md

@@ -0,0 +1,281 @@
+# Codeman Desktop
+
+A small native app that opens Codeman in its own window. Double-click it, and
+it runs Codeman on this Mac (installing it first if it is not there) or
+connects to Codeman on another machine (installing it there over SSH if
+needed), and Codeman fills the window. `⌃⌘F` puts it in full screen.
+
+macOS first: the app runs on 11.3 or later, and Codeman's own page needs the
+WebKit of Safari 16.4 (see Known limits). The same code is meant to build for
+Windows and Linux later.
+
+- **Size:** 4.6 MB for the universal `Codeman.app` (Apple Silicon + Intel), 3 MB as a `.dmg` (measured on the first build).
+- **Stack:** Rust with [tao](https://crates.io/crates/tao) (window and event loop),
+  [wry](https://crates.io/crates/wry) (the system web view: WKWebView on macOS) and
+  [muda](https://crates.io/crates/muda) (native menus), plus [objc2](https://crates.io/crates/objc2)
+  for the two things wry leaves out on macOS (JavaScript dialogs, HTTP Basic login).
+  No bundled browser and no Node in the app.
+- **Server:** unchanged. The app is a client of Codeman's web UI, like a browser tab.
+
+## Why it is cheap
+
+Codeman is already a web app, so the desktop app is a native window around the
+operating system's own web view. An Electron build of the same thing would ship
+a whole Chromium (around 150 MB). The native side only adds what a browser tab
+cannot do.
+
+## What it does (v0.1)
+
+| | |
+| --- | --- |
+| **This Mac** | The connect screen's first tab looks for Codeman on this Mac and offers what fits: *Open Codeman* when it runs, *Start Codeman* when it is installed but stopped, *Install Codeman on this Mac* when it is not there. The address comes from Codeman's LaunchAgent (port, sub-path, HTTPS). When nothing answers there but one of your own Codeman servers runs (found with `ps` and `lsof`: a `codeman web --port 4000` in a terminal, say), the tab opens that one, or says where it listens; it never offers to start a second server, which would take over the first one's sessions, and Start refuses while one runs. A server that runs but listens nowhere yet (the first seconds after login, a restart) shows as *starting*: the tab looks again every second and, when a connect to this Mac had just been refused, opens Codeman once it is up. Start asks launchd to run the LaunchAgent (`kickstart`, or `bootstrap` when it is not loaded), so the server keeps its own settings and supervision; without a LaunchAgent it runs `codeman web -d`. The login comes from where Codeman keeps it: the LaunchAgent's `CODEMAN_USERNAME`/`CODEMAN_PASSWORD`, else `~/.codeman/.env` (what Codeman's command-line clients read), `admin` by default. It goes only to `127.0.0.1` on that Codeman's port, only while one of your own Codeman processes holds that port, is never saved to the Keychain, and never reaches the page. Whether Codeman is installed is looked up in its files and processes, then the login shell; the interactive profile (nvm in `.zshrc`, say) only on *Check again*. Install opens Terminal with Codeman's installer (`install.sh --local --service --port N`): it may ask for the Mac password (Homebrew, Node.js, tmux) and which AI coding tools to set up, then Codeman runs as a LaunchAgent, so it keeps running when the app quits and starts at login. *Also reach it from my phone and other computers* drops `--local`, and the installer asks how (Tailscale, or the local network with a password). Port 3000 is used unless something else answers there, then the next free one. While the installer runs, the app looks every 3 seconds and opens Codeman as soon as it answers; it stops looking after the first answer, after 30 minutes, or 90 seconds after a finished install whose server never answered (then it offers Start). An install still running in Terminal is recognized by its process, so the tab waits for it instead of offering Install twice. |
+| **Another machine** | The second tab connects to a server by address (below). *Codeman is not installed there yet?* opens Terminal, connects with `ssh -t` and runs Codeman's installer on that machine, which asks its questions there; the app then suggests `http://<host>:3000` and the installer prints the real address at the end. The SSH login is checked to the characters of a user and host name (no option can be slipped in) and may carry a `:port`. The remote command runs under `bash -o pipefail`, so a failed download fails the install instead of reporting success. The same tab shows the one-line install command, with a Copy button, to run on a machine by hand. |
+| **Connect screen** | Server address, recent servers, a login for password-protected servers (password kept in the macOS Keychain), auto-connect at launch. An address typed without `http://` or `https://` gets `http://`, except a tailnet name with no port (`machine.tailnet.ts.net`, which is `tailscale serve`), which gets `https://`. It explains each failure: nothing listening; wrong password; too many failed logins (the password field stays open, since a single-user Codeman accepts the right password even then); unknown host name; an address this Mac cannot reach (with a pointer to the Local Network setting); an `http://` address on a port that only speaks HTTPS; an untrusted certificate; a redirect, with a button for the suggested `https://` address; not a Codeman server. A multi-user account that must change its password connects, and Codeman's own dialog asks for the new one. If the server page has not started showing within 15 seconds, or you press Cancel while it opens, the connect screen comes back with a notice. A login that would cross the network over plain `http://` to another machine says so. Return opens or starts the Codeman on this Mac and Esc cancels a connect, as in a Mac dialog (Install always takes a click). On a Mac whose WebKit is too old for Codeman it says so and Connect stays off (see Known limits). |
+| **Start Codeman** | On the This Mac tab, and when `http://127.0.0.1:<port>` or `http://localhost:<port>` answers nothing, one click runs `codeman web -d` (or `~/.codeman/app`) with your login shell's environment, so the server gets your real PATH (Homebrew, nvm) for the agents it spawns. zsh, bash and other POSIX shells run the start themselves; fish, nu, xonsh, tcsh and other shells only report their environment, and the start runs under `/bin/sh` with it. Offered for those two addresses only: `codeman web -d` listens on 127.0.0.1. |
+| **Login** | The app answers the server's HTTP Basic login requests itself, with the login you connected with, so the page keeps working after the server restarts (a restart forgets every session cookie). It answers only for Codeman's own pages under the server's base path: a web tab or a rendered HTML file that asks for a Basic login of its own is left to WebKit and never gets your Codeman password. WebKit keeps no copy of the login, so every request for it gets the current one. Each connect first clears the app's cookies, so connecting to the same server as another user really switches users (local storage, where Codeman keeps its per-device settings, stays; a dashboard in a web tab that keeps its own login in a cookie may ask for it again). A page that still gets a 401 reloads once. If the server refuses the login (the password was changed, say), the app does not keep sending it: it checks it with a single probe, and only if the server refuses that too does the connect screen come back with a notice. That does not take focus from the app you are in: if Codeman is in the background, its Dock icon bounces. |
+| **Dialogs** | Codeman's `confirm()`, `prompt()` and `alert()` (Delete case, Kill all sessions, Update Codeman, discarding unsaved edits, ...) show as native macOS dialogs. wry implements none of them, and without them WKWebView answers Cancel without showing anything. Each dialog's first line names the page it comes from, and says so when that is an embedded frame (a web tab, a rendered HTML preview), so a frame cannot pass its text off as Codeman's. |
+| **Full screen** | `⌃⌘F` or the green button. The last state is restored at launch; *Always Open in Full Screen* forces it. Leaving full screen returns to the saved window size and position. |
+| **Menus** | A real Edit menu (without one, `⌘C`/`⌘V` do nothing in a WKWebView), Reload `⌘R`, Switch Server `⇧⌘O`, Developer Tools `⌥⌘I`. The page sees every key first, so Codeman's own shortcuts keep working. If the main window ends up showing a raw file instead of Codeman, `⌘R` takes it back to Codeman. |
+| **Pop-outs** | Implements Codeman's existing native-wrapper bridge, `window.CodemanHost` (`openInHostWindow` in `src/web/public/app.js`), so popping out a session or a file preview opens a real app window, and the pop-out icon is on by default. Session and rendered-HTML pop-outs come only from Codeman's own pop-out button. A `window.open` from page script opens only Codeman's file and download windows, without taking keyboard focus, at most 3 at once and then 1 per second. Only Codeman's own pop-out pages become app windows (see Decisions); when the app refuses one, Codeman shows a toast. Each pop-out opens a step down and to the right of the window in use, never exactly on top of another one. A web tab's *Open in new tab* opens the dashboard in your default browser, as it would from a browser tab. |
+| **Links** | On Codeman's own pages (the dashboard and session windows), a link to another site opens in your default browser, also on `⌘`-click or a middle click. Pages can send at most 3 links to the browser at once, then 1 per second. Inside a rendered HTML preview or a web tab, a plain link to another site does nothing, while one that asks for a new window (`target="_blank"`, `window.open`) opens in your default browser within the same budget (see Known limits). |
+| **Downloads** | Codeman's Download links, and downloads Codeman opens in a new window, save the file to `~/Downloads` whatever its type, and a toast in Codeman names the file. Files the web view cannot display are saved the same way. |
+| **A page that stops** | When the web content process of a window ends (a WebKit crash, or macOS taking the process back under memory pressure), the window loads its page again instead of staying blank. A second time within 30 seconds, the main window goes back to the connect screen and a pop-out closes, so a page that cannot stay up never becomes a reload loop. |
+| **Window** | Size, position and full-screen state are remembered. A saved window that hangs off the screen it opens on (it was last on a larger display that is gone, say) is pulled back on and shrunk to fit; one whose title bar is on no screen at all opens at the default size instead. Clicking the Dock icon brings back a minimized window. |
+
+## Build (on a Mac)
+
+Needs Rust 1.90 or newer ([rustup](https://rustup.rs); `rustup update` for an older
+toolchain) and the Xcode Command Line Tools (`xcode-select --install`).
+
+```bash
+cd packages/desktop
+cargo test                                  # unit tests
+./scripts/bundle-macos.sh                   # dist/Codeman.app for this Mac's architecture
+./scripts/bundle-macos.sh --universal --dmg # Apple Silicon + Intel, plus dist/Codeman-<version>.dmg
+open dist/Codeman.app
+```
+
+The connect page has its own test, which needs no Mac: from the repository
+root, `npm run test:browser -- test/desktop-connect-page.browser.test.ts` drives
+`assets/connect.html` in Chromium through every state of both tabs, under the
+Content-Security-Policy the app serves it with. It is part of the nightly
+browser suite, not of `npm test`.
+
+The script builds with `--locked` against the committed `Cargo.lock`, targets
+the macOS version in `macos/Info.plist` (`LSMinimumSystemVersion`, 11.3), and
+takes the binary from where cargo says it wrote it, so `CARGO_TARGET_DIR` and a
+cargo config's `build.target-dir` work.
+
+Settings live in `~/Library/Application Support/Codeman/desktop.json`; passwords
+in the Keychain under *Codeman Desktop*, one item per username and server. A
+`desktop.json` the app cannot read or parse is moved aside, never overwritten:
+to `desktop.json.corrupt`, or to the first free name of `desktop.json.corrupt.1`
+to `.corrupt.9` when that one is taken, so an earlier copy is kept. If all ten
+names are taken, or the file cannot be moved, the app starts with default
+settings and saves nothing, which leaves the file where it is. When a server's
+username changes (a change of letter case counts), or a server drops off the
+recent list (it keeps 8), the Keychain item of the old username is deleted.
+
+## Decisions, and why
+
+**tao + wry + muda directly, not Tauri.** Tauri is built on the same three crates.
+The deciding detail is login: Codeman's password protection is HTTP Basic, and
+a WKWebView shows no login dialog of its own (wry 0.57 implements no
+authentication-challenge handler). So the app sends the `Authorization` header
+itself on the first load, with wry's `load_url_with_headers` (Tauri 2.12's
+`navigate()` takes only a URL), and from then on answers the HTTP Basic
+challenges of Codeman's own pages with the current login. Codeman keeps its
+session cookies in memory, so after a server restart that answer is what keeps
+the page logged in. Using the crates directly is also smaller.
+
+**What wry leaves out is added at runtime, not patched in.** `src/macos.rs` adds
+the JavaScript dialog methods and the authentication-challenge method to the
+classes of wry's own delegates, so wry stays an unmodified crates.io dependency.
+
+**What a page may ask of the app** (all in `src/policy.rs`, unit-tested):
+
+- Codeman shows content it did not write on its own origin: rendered HTML files
+  (`/html-view/`) and proxied dashboards (`/webview/`). Only Codeman's own app
+  shell (the dashboard and a session pop-out) may use `window.CodemanHost`.
+  That is an allowlist on the raw path, and a path holding any `%` fails it, so
+  an encoded spelling or a route Codeman adds later stays out.
+- An app window opens only for Codeman's own pop-out pages under the server's
+  base path, checked after decoding the path once, and which ones depends on
+  who asks. `window.CodemanHost` (the app shell only) may open sessions,
+  rendered HTML views, the raw, preview, attachment and folder file routes, the
+  path picker's preview and `api/download`. A `window.open` or `target=_blank` link, which WebKit passes
+  on from any frame without saying which, gets only the file routes and
+  `api/download`, the pages Codeman itself opens that way; otherwise a rendered
+  HTML file could open copies of itself as top-level windows that pass for the
+  app's own. Such a window does not take keyboard focus, and these windows
+  have a budget of their own (3 at once, then 1 per second), apart from the
+  one links draw on. Any other page on the server's origin is refused rather
+  than sent to the browser: a top-level `/webview/` load would escape the web
+  tab's iframe sandbox in either place, so it never opens anywhere.
+  `window.open('')` is refused too, since WebKit's blank window carries none of
+  the app's handlers.
+- wry's navigation handler sees every frame and does not say which one. So a
+  navigation to another site is blocked rather than opened in the browser;
+  otherwise a page full of external iframes could open browser tabs. A real
+  link click is sent out by the injected script in the main frame only.
+- Only `http(s)` URLs ever reach the default browser, at most 3 at once and
+  then 1 per second. macOS lets a page call `window.open` without a click, so
+  this keeps a script from opening a browser tab for every call.
+- The `Authorization` header is only sent to URLs under the server's base path.
+  The login answers a Basic challenge only when it is Codeman's own: the
+  server's scheme, host and port (never a proxy's), a URL below the base path,
+  and not a web tab (`webview/`) or a rendered HTML file (`html-view/`), which
+  relay 401s from content Codeman did not write. Only such a challenge can
+  send the user back to the connect screen. WebKit is handed the login without
+  persistence, so it keeps no copy: every challenge gets the current login,
+  and one from before a Switch Server is never replayed.
+- Each connect starts by clearing the app's cookies (never local storage).
+  Codeman checks its session cookie before the `Authorization` header, so an
+  earlier user's cookie would otherwise win over the new login.
+- Microphone and camera requests prompt per page. wry's default without a
+  handler is to grant them to every frame, sandboxed previews included.
+- The bundled connect page keeps working until a server page commits in the
+  main window (it is still the live page while the server loads), and only
+  the main window may talk to it.
+- `codeman web -d` gets the port and base path as separate arguments, never as
+  shell text.
+
+**The installer runs in Terminal, not inside the app.** `install.sh` asks for
+the administrator password on a terminal (Homebrew, its sudo keep-alive), the
+Xcode tools arrive as a system dialog, and ssh asks about host keys and
+passwords on a terminal too, so an install without one fails on the first
+fresh Mac. The app writes a short script to the per-user temporary folder
+(mode 0700, created fresh, deleted by the script as it starts) and opens it
+with `open -b com.apple.Terminal`, which needs no permission; scripting
+Terminal with osascript would ask for Automation access. The script prints
+what it runs. A This Mac install downloads the installer to a temporary file
+and runs it from there, so the installer's input is the terminal. Everything in
+the scripts is built and unit-tested in `src/setup.rs`; the page sends only
+which install it wants, whether other devices should reach it, and the SSH
+login, which is checked before it is quoted.
+
+**This Mac's own login comes from where Codeman keeps it.** A Codeman
+installed with a password keeps it in its LaunchAgent (`install.sh`) or in
+`~/.codeman/.env` (what `codeman attach`, `codeman tui` and `codeman agent`
+read). The app reads the same places, so a password-protected Codeman on this
+Mac opens without typing the password. The username and password always come
+from the same place, since the server reads its username from its own
+environment. The login goes only to `127.0.0.1` on that Codeman's port, and
+only while `lsof` shows one of your own Codeman processes holding that port:
+with Codeman stopped, whatever else listens there never gets it.
+
+**Never a second server on the same sessions.** Two Codeman servers on one
+data directory and tmux socket attach to each other's live sessions, and
+`codeman web -d` only notices a server it started itself or one at the same
+address. So the app looks for running Codeman servers of this user (`ps`)
+before it offers or runs a start, and opens the one it finds instead.
+
+**Closing the main window quits the app.** Codeman's sessions keep running on
+the server, so nothing is lost, and reopening takes about a second.
+
+**One reachability probe per user action, and one to check a refused login.**
+Codeman counts a request without valid credentials against its login rate
+limit (10 per IP, 15 minutes; a successful login resets the count), so the app
+never retries in a loop. Once the server refuses the login in a challenge, the
+app sends it only once more, in the single probe that checks the refusal. If
+that probe is refused or rate limited, the connect screen comes back; the
+app does not send the refused login again. Keeping no copy of the login in WebKit has a cost here: after a server
+restart, each request that arrives without a cookie gets a 401 before the
+login goes out, and those count until one succeeds. Many windows reconnecting
+at once can push a request past 10, and that request then fails with a 429
+instead of being answered. A refusal that lands while you are in another app
+does not bring Codeman forward: the connect screen loads where the window is,
+and the Dock icon bounces.
+
+## Known limits
+
+- **Self-signed HTTPS is refused.** A server started with `codeman web --https`
+  uses a self-signed certificate, and WKWebView rejects it (wry has no trust
+  override). Use `http://127.0.0.1:3000` for a server on this Mac. For another
+  machine, serve Codeman through `tailscale serve`
+  (`https://<machine>.<tailnet>.ts.net` has a real certificate) or a reverse
+  proxy with a real certificate. Marking the certificate as trusted in
+  Keychain Access can only help at `https://localhost` or `https://127.0.0.1`,
+  the only names Codeman's certificate carries, and may not work even there.
+  The connect screen says so when it happens.
+- **Keychain prompt after every rebuild of an ad-hoc build.** The Keychain
+  knows the app that saved a password by its code signature, and an ad-hoc
+  signature changes with every build and update. So each new build asks once
+  for access to the saved passwords: choose *Always Allow*. All Keychain work
+  runs on one background thread, so the prompt does not freeze the window
+  while it waits for an answer. To keep one identity across builds, sign with
+  `SIGN_IDENTITY` (a self-made code-signing certificate from Keychain Access
+  is enough). Microphone and camera permissions are asked again for the same
+  reason.
+- **Gatekeeper.** Without a Developer ID the app is signed ad hoc. A build you
+  made yourself opens normally; a copy that arrived by download or AirDrop is
+  quarantined. On macOS 15 and later, try to open it once, then click *Open
+  Anyway* in System Settings > Privacy & Security (it asks for an administrator
+  password). On macOS 14 and earlier, right-click it and choose *Open* once.
+  Either way, `xattr -dr com.apple.quarantine /Applications/Codeman.app` on the
+  copy in Applications works too. Shipping it to other people needs a Developer
+  ID signature and notarization:
+  `SIGN_IDENTITY="Developer ID Application: ..." ./scripts/bundle-macos.sh --dmg`,
+  then `xcrun notarytool submit` and `xcrun stapler staple`.
+- **Local Network permission (macOS 15 and later).** The first connection to an
+  address on the local network (a LAN IP, a `.local` name) makes macOS ask
+  whether Codeman may use the local network, and that first attempt can fail
+  while the question is open: connect again after answering. If it was denied,
+  turn Codeman on in System Settings > Privacy & Security > Local Network. A
+  server started with *Start Codeman on this Mac* counts as part of the app
+  here, so the same answer covers what it reaches on the local network (ssh to
+  LAN hosts, Wake-on-LAN, web tabs pointing at LAN dashboards), also after the
+  app quits.
+- **Subagent transcript windows do not open in the app.** Codeman writes that
+  view into a blank `window.open('')` window, which the app refuses (see
+  Decisions), and shows a toast instead. A Codeman without the null check in
+  `viewSubagentTranscript` (`src/web/public/panels-ui.js`) reports *Failed to
+  load transcript* there. Open the transcript from a browser tab.
+- **Dialogs are app-modal.** While a JavaScript dialog is open, every Codeman
+  window waits for it. A page that calls `alert()` in a loop (a rendered HTML
+  preview or a web tab can) leaves no way out but Force Quit (`⌥⌘⎋`).
+- **Codeman needs the WebKit of Safari 16.4.** The app itself runs on macOS
+  11.3 or later (downloads go through WKDownload, which arrived in 11.3), but
+  Codeman's terminal (xterm.js 6 uses class static blocks) needs the WebKit
+  that came with Safari 16.4: macOS 13.3, or macOS 11 or 12 with Safari 16.4
+  or later installed. On an older WebKit the connect screen says so and does
+  not connect. Session pop-outs also need BroadcastChannel (Safari 15.4),
+  which the same requirement covers.
+- **Plain links in rendered HTML and web tabs do not open.** A link to another
+  site inside a rendered HTML preview or a web tab does nothing, in the
+  preview overlay, and for a rendered HTML file in its pop-out window too: the
+  app blocks navigation to other sites in every frame (see Decisions). A link
+  there that asks for a new window (`target="_blank"`, or a script's
+  `window.open`) does open, in your default browser, within the budget of 3 at
+  once and then 1 per second.
+- **No login dialog for a web tab's own HTTP Basic login.** The app answers
+  only Codeman's own login, and WebKit shows no dialog for any other, so a
+  dashboard in a web tab that asks for HTTP Basic shows its 401 page.
+- **Downloads from previews and web tabs are saved without asking.** Rendered
+  HTML files and web tabs are allowed to start downloads, and the app saves
+  every download to `~/Downloads` without a prompt. Asking first for those
+  frames is not done yet.
+- **No desktop notifications yet.** WKWebView has no Web Notification API.
+  Native notifications are the first item on the list below.
+- **No service worker.** Codeman works without it; it is only an offline cache.
+- **Installing from the app is macOS only so far**, and installing on another
+  machine needs ssh access to it and `curl` or `wget` there. The app does not
+  know when a remote install is done or which address it chose: the installer
+  prints the address, and you connect to it under Another machine.
+- **A This Mac install always sets Codeman up as a LaunchAgent** that starts
+  at login. To stop it: `launchctl unload ~/Library/LaunchAgents/com.codeman.web.plist`;
+  to remove Codeman: `curl -fsSL https://getcodeman.com/install | bash -s -- uninstall`.
+- **Windows and Linux** need their menu hookup (`init_for_hwnd`, GTK), a
+  credential store (Credential Manager, Secret Service) and installers. The
+  rest of the code is platform-neutral.
+
+## Ideas for next
+
+- Native notifications and a Dock badge with the number of sessions waiting
+  for you (tao has `set_badge_label`; Codeman already tracks which sessions need input).
+- A global hotkey that brings Codeman to the front from anywhere.
+- A menu bar icon showing session states.
+- Trusting a self-signed server certificate by its fingerprint.
+- Asking before a download that a rendered HTML file or a web tab starts.
+- A way out of a page that keeps opening dialogs (a "block further dialogs" option).
+- Windows and Linux builds, a CI job that builds the `.dmg`, notarization, auto-update.

packages/desktop/macos/Info.plist

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleName</key>
+	<string>Codeman</string>
+	<key>CFBundleDisplayName</key>
+	<string>Codeman</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.getcodeman.desktop</string>
+	<key>CFBundleVersion</key>
+	<string>__VERSION__</string>
+	<key>CFBundleShortVersionString</key>
+	<string>__VERSION__</string>
+	<key>CFBundleExecutable</key>
+	<string>codeman-desktop</string>
+	<key>CFBundleIconFile</key>
+	<string>Codeman</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<!-- 11.3 is where WKDownload arrived; wry saves files through it. Below
+	     that a Download link replaces the window or saves nothing.
+	     scripts/bundle-macos.sh builds for this version too. -->
+	<key>LSMinimumSystemVersion</key>
+	<string>11.3</string>
+	<key>LSApplicationCategoryType</key>
+	<string>public.app-category.developer-tools</string>
+	<key>NSHighResolutionCapable</key>
+	<true/>
+	<key>NSSupportsAutomaticGraphicsSwitching</key>
+	<true/>
+	<key>NSHumanReadableCopyright</key>
+	<string>MIT License, Codeman Contributors</string>
+	<!-- Voice dictation and gesture control ask for these; without the
+	     strings macOS kills the app the first time a page requests them. -->
+	<key>NSMicrophoneUsageDescription</key>
+	<string>Codeman uses the microphone for voice dictation when you turn it on.</string>
+	<key>NSCameraUsageDescription</key>
+	<string>Codeman uses the camera for hand-gesture control when you turn it on.</string>
+	<!-- macOS 15 asks before an app reaches the local network (a LAN address,
+	     a .local name), and shows this text in that question. A process the
+	     app starts counts as the app (Apple TN3179), so a server started with
+	     "Start Codeman on this Mac" runs under the same answer. -->
+	<key>NSLocalNetworkUsageDescription</key>
+	<string>Codeman connects to Codeman servers on your local network. A Codeman server you start from this app uses the same permission for what it reaches on the network.</string>
+	<!-- App Transport Security would block plain http:// to a host NAME
+	     (my-mac.local, a LAN box). IP literals are exempt, which is why
+	     http://127.0.0.1 works without this. -->
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsLocalNetworking</key>
+		<true/>
+		<key>NSAllowsArbitraryLoadsInWebContent</key>
+		<true/>
+	</dict>
+</dict>
+</plist>

packages/desktop/macos/entitlements.plist

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<!-- Only used with a Developer ID (SIGN_IDENTITY=...), which turns on the
+	     hardened runtime; there, microphone and camera need these. -->
+	<key>com.apple.security.device.audio-input</key>
+	<true/>
+	<key>com.apple.security.device.camera</key>
+	<true/>
+</dict>
+</plist>

packages/desktop/rustfmt.toml

@@ -0,0 +1 @@
+max_width = 120

packages/desktop/scripts/bundle-macos.sh

@@ -0,0 +1,110 @@
+#!/usr/bin/env bash
+# Build Codeman.app (and optionally a .dmg) from packages/desktop, on macOS.
+#
+#   packages/desktop/scripts/bundle-macos.sh            # this Mac's architecture
+#   packages/desktop/scripts/bundle-macos.sh --universal --dmg
+#   SIGN_IDENTITY="Developer ID Application: ..." packages/desktop/scripts/bundle-macos.sh --dmg
+#
+# Without SIGN_IDENTITY the app is signed ad hoc: it runs on the Mac that built
+# it, and a copy downloaded on another Mac is stopped by Gatekeeper. On macOS 15
+# and later, try to open it once, then click Open Anyway in System Settings >
+# Privacy & Security; on macOS 14 and earlier, right-click it and choose Open.
+# Or run `xattr -dr com.apple.quarantine /Applications/Codeman.app` on the copy
+# in /Applications. A Developer ID signature + notarization avoids all of this.
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+[ "$(uname -s)" = Darwin ] || { echo "bundle-macos.sh runs on macOS only" >&2; exit 1; }
+
+UNIVERSAL=0
+DMG=0
+for arg in "$@"; do
+  case "$arg" in
+    --universal) UNIVERSAL=1 ;;
+    --dmg) DMG=1 ;;
+    *) echo "unknown option: $arg" >&2; exit 2 ;;
+  esac
+done
+
+VERSION=$(sed -n 's/^version = "\(.*\)"$/\1/p' Cargo.toml | head -1)
+[ -n "$VERSION" ] || { echo "could not read the version from Cargo.toml" >&2; exit 1; }
+
+# The binary targets the same macOS as LSMinimumSystemVersion in Info.plist,
+# so the two cannot disagree.
+MACOSX_DEPLOYMENT_TARGET=$(/usr/libexec/PlistBuddy -c 'Print :LSMinimumSystemVersion' macos/Info.plist)
+[ -n "$MACOSX_DEPLOYMENT_TARGET" ] || { echo "could not read LSMinimumSystemVersion from macos/Info.plist" >&2; exit 1; }
+export MACOSX_DEPLOYMENT_TARGET
+
+WORK=$(mktemp -d)
+trap 'rm -rf "$WORK"' EXIT
+
+# Build with cargo and set BUILT to the executable cargo reports for
+# codeman-desktop. Asking cargo, rather than assuming ./target, keeps
+# CARGO_TARGET_DIR, build.target-dir and build.target from a cargo config
+# working, and a stale binary from an older build is never bundled.
+cargo_build() {
+  local json
+  json=$(cargo build --locked --release "$@" --message-format=json-render-diagnostics)
+  BUILT=$(printf '%s\n' "$json" | awk '
+    index($0, "\"reason\":\"compiler-artifact\"") &&
+    index($0, "\"kind\":[\"bin\"]") &&
+    index($0, "\"name\":\"codeman-desktop\"") &&
+    match($0, /"executable":"[^"]*"/) { path = substr($0, RSTART + 14, RLENGTH - 15) }
+    END { print path }')
+  if [ -z "$BUILT" ] || [ ! -x "$BUILT" ]; then
+    echo "cargo did not report a codeman-desktop executable${BUILT:+ (it named $BUILT)}" >&2
+    exit 1
+  fi
+}
+
+if [ "$UNIVERSAL" = 1 ]; then
+  rustup target add aarch64-apple-darwin x86_64-apple-darwin >/dev/null
+  cargo_build --target aarch64-apple-darwin
+  ARM_BIN=$BUILT
+  cargo_build --target x86_64-apple-darwin
+  INTEL_BIN=$BUILT
+  BIN="$WORK/codeman-desktop-universal"
+  lipo -create -output "$BIN" "$ARM_BIN" "$INTEL_BIN"
+else
+  cargo_build
+  BIN=$BUILT
+fi
+
+APP=dist/Codeman.app
+rm -rf "$APP"
+mkdir -p "$APP/Contents/MacOS" "$APP/Contents/Resources"
+cp "$BIN" "$APP/Contents/MacOS/codeman-desktop"
+sed "s/__VERSION__/$VERSION/g" macos/Info.plist > "$APP/Contents/Info.plist"
+plutil -lint "$APP/Contents/Info.plist" >/dev/null
+printf 'APPL????' > "$APP/Contents/PkgInfo"
+
+# assets/icon.png (1024x1024, already on Apple's icon grid) -> Codeman.icns
+ICONSET="$WORK/Codeman.iconset"
+mkdir -p "$ICONSET"
+for size in 16 32 128 256 512; do
+  sips -z "$size" "$size" assets/icon.png --out "$ICONSET/icon_${size}x${size}.png" >/dev/null
+  double=$((size * 2))
+  sips -z "$double" "$double" assets/icon.png --out "$ICONSET/icon_${size}x${size}@2x.png" >/dev/null
+done
+iconutil -c icns "$ICONSET" -o "$APP/Contents/Resources/Codeman.icns"
+
+if [ -n "${SIGN_IDENTITY:-}" ]; then
+  codesign --force --options runtime --timestamp \
+    --entitlements macos/entitlements.plist --sign "$SIGN_IDENTITY" "$APP"
+else
+  codesign --force --sign - "$APP"
+fi
+codesign --verify --strict "$APP"
+
+echo "Built $(pwd)/$APP ($(du -sh "$APP" | cut -f1), version $VERSION, macOS $MACOSX_DEPLOYMENT_TARGET or later)"
+
+if [ "$DMG" = 1 ]; then
+  STAGE="$WORK/dmg"
+  mkdir -p "$STAGE"
+  cp -R "$APP" "$STAGE/"
+  ln -s /Applications "$STAGE/Applications"
+  DMG_PATH="dist/Codeman-$VERSION.dmg"
+  rm -f "$DMG_PATH"
+  hdiutil create -quiet -volname "Codeman" -srcfolder "$STAGE" -ov -format UDZO "$DMG_PATH"
+  echo "Built $(pwd)/$DMG_PATH ($(du -sh "$DMG_PATH" | cut -f1))"
+fi

packages/desktop/src/assets.rs

@@ -0,0 +1,312 @@
+//! Files bundled into the binary: the connect page, its icon, and the script
+//! injected into every Codeman page (`window.CodemanHost`).
+
+use std::borrow::Cow;
+use wry::http::{header::CONTENT_TYPE, Request, Response, StatusCode};
+
+const CONNECT_HTML: &[u8] = include_bytes!("../assets/connect.html");
+const ICON_PNG: &[u8] = include_bytes!("../assets/icon.png");
+
+/// The connect page loads nothing from outside the app.
+const CSP: &str = "default-src 'none'; script-src 'unsafe-inline'; style-src 'unsafe-inline'; img-src codemanapp:";
+
+/// Serve `codemanapp://localhost/<path>`.
+pub fn respond(request: Request<Vec<u8>>) -> Response<Cow<'static, [u8]>> {
+    let (body, mime): (&'static [u8], &str) = match request.uri().path() {
+        "/" | "/index.html" => (CONNECT_HTML, "text/html; charset=utf-8"),
+        "/icon.png" => (ICON_PNG, "image/png"),
+        _ => {
+            return Response::builder()
+                .status(StatusCode::NOT_FOUND)
+                .body(Cow::Borrowed(&b"not found"[..]))
+                .expect("static response");
+        }
+    };
+    Response::builder()
+        .header(CONTENT_TYPE, mime)
+        .header("Content-Security-Policy", CSP)
+        .header("Cache-Control", "no-store")
+        .body(Cow::Borrowed(body))
+        .expect("static response")
+}
+
+/// Injected at document start into the MAIN frame of every page (wry's
+/// default), where it does nothing unless the page is http(s). It provides the
+/// native-wrapper bridge Codeman's frontend already looks for
+/// (`window.CodemanHost.openWindow/closeWindow/focusWindow`, see
+/// `openInHostWindow` in src/web/public/app.js), so pop-outs become real app
+/// windows. `openWindow` answers false, posting nothing, for a URL the native
+/// side would drop (not http(s), or longer than its 4096-byte cap), so
+/// Codeman shows its own error instead of marking a session detached with no
+/// window behind it. Besides that it:
+///
+/// - turns a click on a same-origin download link (`download=true`, or a path
+///   ending in `/download`) into a real download by giving the link a
+///   `download` attribute. Codeman's file tree and attachment cards link to
+///   `file-raw?download=true` without one, and the server sends a type WebKit
+///   can show (png, pdf, txt), so WebKit would otherwise replace the Codeman
+///   window with the file, with no way back. This runs in the capture phase,
+///   before the file tree's own `stopPropagation`.
+/// - does the same for `window.open` of such a `download=true` URL (the
+///   attachment history), returning null instead of a window.
+/// - sends clicks on links to other sites to the default browser, after
+///   Codeman's own handlers have had their turn (bubble phase, skipped when
+///   one of them called preventDefault). Middle clicks and modifier clicks
+///   count too: a bare WKWebView has no new-tab gesture of its own, so they
+///   would do nothing.
+/// - reports the first same-origin 401 a `fetch` gets (`sessionExpired`),
+///   once per page load: the session cookie is gone, usually because the
+///   server restarted, and nothing in the page asks for the login again.
+/// - defines `__codemanDesktopRefused(id)` (not enumerable) for
+///   [`refused_script`].
+pub const HOST_SHIM: &str = r#"(function () {
+  'use strict';
+  if (!/^https?:$/.test(location.protocol) || window.CodemanHost) return;
+  var MAX_URL = 4096;
+  var post = function (msg) {
+    try { window.ipc.postMessage(JSON.stringify(msg)); return true; } catch (e) { return false; }
+  };
+  // An http(s) URL object, or null. fetch and window.open resolve against
+  // the document base (Codeman sets <base href>), so those pass it.
+  var httpUrl = function (raw, base) {
+    try {
+      var u = new URL(String(raw), base || location.href);
+      return /^https?:$/.test(u.protocol) ? u : null;
+    } catch (e) { return null; }
+  };
+  var sameOrigin = function (u) { return !!u && u.origin === location.origin; };
+  var link = function (ev) {
+    var a = ev.target && ev.target.closest ? ev.target.closest('a[href]') : null;
+    return a && typeof a.href === 'string' && !a.hasAttribute('download') ? a : null;
+  };
+
+  Object.defineProperty(window, 'CodemanHost', {
+    value: Object.freeze({
+      desktop: true,
+      openWindow: function (url) {
+        var u = httpUrl(url);
+        return u && u.href.length <= MAX_URL ? post({ cmd: 'openWindow', url: u.href }) : false;
+      },
+      closeWindow: function () { post({ cmd: 'closeWindow' }); },
+      focusWindow: function () { post({ cmd: 'focusWindow' }); }
+    })
+  });
+
+  // The native side could not open a window: say so. `id` is a string only
+  // when CodemanHost.openWindow asked for that session's pop-out; that session
+  // goes back to the dashboard (a fresh channel object, so this window's own
+  // channel hears it too). Anything else, null included, only shows the toast.
+  Object.defineProperty(window, '__codemanDesktopRefused', {
+    value: function (id) {
+      try {
+        if (window.app && typeof window.app.showToast === 'function') {
+          window.app.showToast('Could not open a new window', 'error');
+        }
+      } catch (e) {}
+      try {
+        if (typeof id === 'string' && id !== '' && typeof BroadcastChannel === 'function') {
+          var ch = new BroadcastChannel('codeman-windows');
+          ch.postMessage({ type: 'redocked', id: id });
+          setTimeout(function () { try { ch.close(); } catch (e) {} }, 2000);
+        }
+      } catch (e) {}
+    }
+  });
+
+  var markDownload = function (ev) {
+    if (ev.button > 1) return;
+    var a = link(ev);
+    var u = a && httpUrl(a.href);
+    if (sameOrigin(u) && (u.searchParams.get('download') === 'true' || /\/download$/.test(u.pathname))) {
+      a.setAttribute('download', '');
+    }
+  };
+  window.addEventListener('click', markDownload, true);
+  window.addEventListener('auxclick', markDownload, true);
+
+  var lastMiddle = null;
+  var openOutside = function (ev) {
+    if (ev.defaultPrevented || ev.button > 1) return;
+    var a = link(ev);
+    var u = a && httpUrl(a.href);
+    if (!u || sameOrigin(u)) return;
+    ev.preventDefault();
+    // Older WebKit sends a middle click as 'click', newer as 'auxclick'; one
+    // that sent both must still open the link once.
+    if (ev.button === 1) {
+      if (lastMiddle && lastMiddle.a === a && ev.timeStamp - lastMiddle.t < 500) return;
+      lastMiddle = { a: a, t: ev.timeStamp };
+    }
+    post({ cmd: 'openExternal', url: u.href });
+  };
+  window.addEventListener('click', openOutside, false);
+  window.addEventListener('auxclick', openOutside, false);
+
+  var nativeOpen = window.open;
+  if (typeof nativeOpen === 'function') {
+    window.open = function open(url) {
+      try {
+        var u = arguments.length && url !== undefined ? httpUrl(url, document.baseURI) : null;
+        if (sameOrigin(u) && u.searchParams.get('download') === 'true') {
+          var a = document.createElement('a');
+          a.href = u.href;
+          a.setAttribute('download', '');
+          a.click();
+          return null;
+        }
+      } catch (e) {}
+      return nativeOpen.apply(this, arguments);
+    };
+  }
+
+  // Returns the promise fetch itself returned, so callers see exactly what
+  // they saw before; the 401 check hangs off a side branch that swallows its
+  // own errors and never reads the body.
+  var expired = false;
+  var nativeFetch = window.fetch;
+  if (typeof nativeFetch === 'function') {
+    var check = function (input, r) {
+      if (expired || !r || r.status !== 401) return;
+      var raw = r.url || (input && typeof input === 'object' && typeof input.url === 'string' ? input.url : input);
+      if (!sameOrigin(httpUrl(raw, document.baseURI))) return;
+      expired = true;
+      post({ cmd: 'sessionExpired' });
+    };
+    window.fetch = function fetch(input) {
+      var p = nativeFetch.apply(this, arguments);
+      try {
+        if (!expired && p && typeof p.then === 'function') {
+          p.then(function (r) { try { check(input, r); } catch (e) {} }, function () {});
+        }
+      } catch (e) {}
+      return p;
+    };
+  }
+})();"#;
+
+/// A toast inside Codeman when a download finished (Codeman's own
+/// `showToast`; nothing happens on a page without it).
+pub fn download_toast_script(file_name: &str, ok: bool) -> String {
+    let text = if ok {
+        format!("Downloaded {file_name} to Downloads")
+    } else {
+        format!("Download of {file_name} failed")
+    };
+    let text = serde_json::to_string(&text).unwrap_or_else(|_| "\"Download finished\"".into());
+    let kind = if ok { "\"success\"" } else { "\"error\"" };
+    format!("try {{ window.app && window.app.showToast && window.app.showToast({text}, {kind}); }} catch (e) {{}}")
+}
+
+/// Runs in the window that asked for a window the native side did not open
+/// (pop-out limit reached, policy refused it, window or web view failed to
+/// build): the page shows an error toast. Does nothing on a page without the
+/// shim.
+///
+/// `session_id` is the decoded id of a session pop-out
+/// (`policy::session_id_of`), and only for a `CodemanHost.openWindow` request,
+/// which comes from a trusted frame: that session then gets its tab back in
+/// the dashboard. Pass `None` for every other refusal, above all the ones a
+/// `window.open` or `target=_blank` from any frame caused, so a page cannot
+/// make the dashboard drop the detached state of a session that is still
+/// popped out.
+pub fn refused_script(session_id: Option<&str>) -> String {
+    let id = serde_json::to_string(&session_id).unwrap_or_else(|_| "null".into());
+    format!(
+        "try {{ if (typeof window.__codemanDesktopRefused === 'function') window.__codemanDesktopRefused({id}); }} catch (e) {{}}"
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn get(path: &str) -> Response<Cow<'static, [u8]>> {
+        respond(
+            Request::builder()
+                .uri(format!("codemanapp://localhost{path}"))
+                .body(Vec::new())
+                .unwrap(),
+        )
+    }
+
+    #[test]
+    fn serves_page_and_icon_only() {
+        let page = get("/index.html");
+        assert_eq!(page.status(), StatusCode::OK);
+        assert!(page.headers()["content-type"]
+            .to_str()
+            .unwrap()
+            .starts_with("text/html"));
+        assert!(page.headers().contains_key("content-security-policy"));
+        assert!(String::from_utf8_lossy(page.body()).contains("window.__codemanDesktop"));
+        assert_eq!(get("/icon.png").status(), StatusCode::OK);
+        assert_eq!(get("/../etc/passwd").status(), StatusCode::NOT_FOUND);
+        assert_eq!(get("/other.js").status(), StatusCode::NOT_FOUND);
+    }
+
+    #[test]
+    fn refused_script_escapes_the_session_id() {
+        let js = refused_script(Some("a'\"); alert(1); //\u{2028}\\"));
+        assert!(js.starts_with("try { if (typeof window.__codemanDesktopRefused === 'function') "));
+        assert!(js.contains(r#"window.__codemanDesktopRefused("a'\"); alert(1); //"#));
+        assert!(js.contains("\u{2028}\\\\\"); } catch (e) {}"));
+        assert!(js.ends_with(" } catch (e) {}"));
+    }
+
+    #[test]
+    fn refused_script_without_a_session_passes_null() {
+        assert_eq!(
+            refused_script(None),
+            "try { if (typeof window.__codemanDesktopRefused === 'function') window.__codemanDesktopRefused(null); } catch (e) {}"
+        );
+        assert!(refused_script(Some("")).contains("__codemanDesktopRefused(\"\")"));
+    }
+
+    #[test]
+    fn shim_keeps_its_contract() {
+        for needle in [
+            "Object.freeze",
+            "openWindow",
+            "closeWindow",
+            "focusWindow",
+            "__codemanDesktopRefused",
+            "sessionExpired",
+            "'auxclick'",
+            "MAX_URL = 4096",
+            "typeof id === 'string' && id !== ''",
+        ] {
+            assert!(HOST_SHIM.contains(needle), "{needle}");
+        }
+        // The refused hook takes the session id the native side resolved; it
+        // never parses or decodes a URL to find one.
+        assert!(!HOST_SHIM.contains("decodeURIComponent"));
+    }
+
+    /// The connect page refuses what the app would drop without an answer, so
+    /// its two limits have to be the app's own.
+    #[test]
+    fn connect_page_keeps_the_message_limits() {
+        let page = String::from_utf8_lossy(CONNECT_HTML);
+        for needle in [
+            format!("var MAX_URL = {};", crate::policy::MAX_URL_LEN),
+            format!("var MAX_FIELD = {};", crate::policy::MAX_FIELD_LEN),
+        ] {
+            assert!(page.contains(&needle), "{needle}");
+        }
+    }
+
+    /// Copy puts setup::INSTALL_ONE_LINER on the clipboard, and the page shows
+    /// the command as text of its own: the two have to be the same command.
+    #[test]
+    fn connect_page_shows_the_command_that_copy_copies() {
+        let page = String::from_utf8_lossy(CONNECT_HTML);
+        let shown = format!("<code id=\"oneliner\">{}</code>", crate::setup::INSTALL_ONE_LINER);
+        assert!(page.contains(&shown), "{shown}");
+    }
+
+    #[test]
+    fn toast_escapes_file_names() {
+        let js = download_toast_script("a\"); alert(1); (\".txt", true);
+        assert!(js.contains(r#"Downloaded a\"); alert(1); (\".txt to Downloads"#));
+    }
+}

packages/desktop/src/config.rs

@@ -0,0 +1,822 @@
+//! The app's own settings: recent servers, two preferences and the window
+//! frame. Stored as JSON next to other per-app data
+//! (`~/Library/Application Support/Codeman/desktop.json` on macOS). Passwords
+//! never go here; they live in the Keychain (see `credentials`).
+
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+
+const MAX_SERVERS: usize = 8;
+/// How many recovery copies of an unreadable config can sit side by side:
+/// `desktop.json.corrupt`, then `desktop.json.corrupt.1` to `.9`.
+const ASIDE_SLOTS: usize = 10;
+const MIN_WIDTH: f64 = 480.0;
+const MIN_HEIGHT: f64 = 360.0;
+const MAX_EDGE: f64 = 20_000.0;
+
+/// Height of a standard title bar, in points.
+const TITLE_BAR: f64 = 28.0;
+/// How far the outer top of the window lies above `WindowFrame::y`. On macOS
+/// `y` is the content area's top (tao's `with_position` puts the content rect
+/// there and the title bar above it); elsewhere `y` is already the outer top.
+const TITLE_ABOVE_Y: f64 = if cfg!(target_os = "macos") { TITLE_BAR } else { 0.0 };
+/// How much of the title bar must be on a screen to grab it.
+const MIN_GRIP: f64 = 80.0;
+/// Room `fitted_to` leaves when it shrinks a window. Screens are full display
+/// bounds, so the menu bar and the Dock are inside them.
+const FIT_MARGIN_X: f64 = 40.0;
+const FIT_MARGIN_Y: f64 = 80.0;
+/// Room a first-run window leaves above its content (the menu bar, taller on
+/// a display with a notch, and its own title bar) and below it (a Dock of the
+/// default size): `Rect` is the whole display, so neither is taken off yet.
+const FIRST_RUN_ROOM_ABOVE: f64 = 66.0;
+const FIRST_RUN_ROOM_BELOW: f64 = 90.0;
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(default, rename_all = "camelCase")]
+pub struct Config {
+    /// Most recent first.
+    pub servers: Vec<ServerEntry>,
+    /// Connect to the most recent server at launch.
+    pub auto_connect: bool,
+    /// Always open in full screen (otherwise the last state is restored).
+    pub start_fullscreen: bool,
+    /// Anything that is not a whole frame reads as None: a bad frame must not
+    /// make the whole file unreadable, which would cost the server list.
+    #[serde(deserialize_with = "lenient_window")]
+    pub window: Option<WindowFrame>,
+}
+
+fn lenient_window<'de, D: serde::Deserializer<'de>>(d: D) -> Result<Option<WindowFrame>, D::Error> {
+    let value = serde_json::Value::deserialize(d)?;
+    Ok(serde_json::from_value(value).ok())
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Config {
+            servers: Vec::new(),
+            auto_connect: true,
+            start_fullscreen: false,
+            window: None,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct ServerEntry {
+    pub url: String,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub username: Option<String>,
+    #[serde(default)]
+    pub has_saved_password: bool,
+}
+
+/// The main window's position and inner size, in logical (point)
+/// coordinates. `x`/`y` are where tao's `with_position` wants them: on macOS
+/// the top-left of the CONTENT area (the title bar, about 28 pt, sits above
+/// it), elsewhere the window's outer top-left. Saving the outer corner on
+/// macOS and restoring it as the content corner made the window creep up by
+/// a title bar on every launch.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct WindowFrame {
+    pub x: f64,
+    pub y: f64,
+    pub width: f64,
+    pub height: f64,
+    #[serde(default)]
+    pub fullscreen: bool,
+}
+
+/// A display's full bounds in logical coordinates, as tao reports them. This
+/// is the whole display, not the work area: the menu bar and the Dock are
+/// inside it.
+#[derive(Debug, Clone, Copy)]
+pub struct Rect {
+    pub x: f64,
+    pub y: f64,
+    pub width: f64,
+    pub height: f64,
+}
+
+impl WindowFrame {
+    /// The frame of a first-run window on `screen`: `size` or what fits, never
+    /// less than `min`, centred across and in the height between the menu bar
+    /// and the Dock. Centring in the whole display put the bottom of a window
+    /// under the Dock on a 900 pt high one.
+    pub fn first_run(screen: &Rect, size: (f64, f64), min: (f64, f64)) -> WindowFrame {
+        let width = size.0.min(screen.width - FIT_MARGIN_X).max(min.0);
+        let room = screen.height - FIRST_RUN_ROOM_ABOVE - FIRST_RUN_ROOM_BELOW;
+        let height = size.1.min(room).max(min.1);
+        WindowFrame {
+            x: screen.x + (screen.width - width) / 2.0,
+            y: screen.y + FIRST_RUN_ROOM_ABOVE + ((room - height) / 2.0).max(0.0),
+            width,
+            height,
+            fullscreen: false,
+        }
+    }
+
+    /// The frame clamped to sane sizes, or None when it holds junk.
+    pub fn sanitized(self) -> Option<WindowFrame> {
+        let vals = [self.x, self.y, self.width, self.height];
+        if vals.iter().any(|v| !v.is_finite()) || self.x.abs() > MAX_EDGE || self.y.abs() > MAX_EDGE {
+            return None;
+        }
+        Some(WindowFrame {
+            width: self.width.clamp(MIN_WIDTH, MAX_EDGE),
+            height: self.height.clamp(MIN_HEIGHT, MAX_EDGE),
+            ..self
+        })
+    }
+
+    /// The frame made to fit the screens it will open on, or None when its
+    /// title bar is on none of them (the caller then falls back to a default
+    /// frame). An edge that no screen covers is pulled onto the screen that
+    /// holds the title bar, shrinking the window when it is too big for it:
+    /// a frame saved on an external display that is gone would otherwise
+    /// open with its right edge and resize corner far off screen. An edge
+    /// that lands on some screen stays put, so a window spanning two
+    /// displays keeps its span. `min` is the window's minimum inner size.
+    pub fn fitted_to(&self, screens: &[Rect], min: (f64, f64)) -> Option<WindowFrame> {
+        let home = *self.title_screen(screens)?;
+        let top = self.outer_top();
+        let outer_height = TITLE_BAR + self.height;
+        let (x, width) = fit_axis(
+            self.x,
+            self.width,
+            (
+                covers_x(screens, self.x, top, top + outer_height),
+                covers_x(screens, self.x + self.width, top, top + outer_height),
+            ),
+            (home.x, home.x + home.width),
+            FIT_MARGIN_X,
+            min.0,
+        );
+        let (top, outer_height) = fit_axis(
+            top,
+            outer_height,
+            (
+                covers_y(screens, top, x, x + width),
+                covers_y(screens, top + outer_height, x, x + width),
+            ),
+            (home.y, home.y + home.height),
+            FIT_MARGIN_Y - TITLE_BAR,
+            min.1 + TITLE_BAR,
+        );
+        Some(WindowFrame {
+            x,
+            y: top + TITLE_ABOVE_Y,
+            width,
+            height: outer_height - TITLE_BAR,
+            ..*self
+        })
+    }
+
+    fn outer_top(&self) -> f64 {
+        self.y - TITLE_ABOVE_Y
+    }
+
+    /// The screen the title bar is on, or None when no screen has enough of
+    /// it to grab (a display unplugged since the last run leaves the frame off
+    /// screen). The middle of the title bar must be inside the screen and at
+    /// least `MIN_GRIP` of the bar's width must overlap it; when several
+    /// qualify, the one holding most of the bar wins.
+    fn title_screen<'a>(&self, screens: &'a [Rect]) -> Option<&'a Rect> {
+        let title_y = self.outer_top() + TITLE_BAR / 2.0;
+        screens
+            .iter()
+            .filter(|m| title_y >= m.y && title_y <= m.y + m.height)
+            .map(|m| {
+                let grip = (self.x + self.width).min(m.x + m.width) - self.x.max(m.x);
+                (m, grip)
+            })
+            .filter(|(_, grip)| *grip >= MIN_GRIP)
+            .max_by(|a, b| a.1.total_cmp(&b.1))
+            .map(|(m, _)| m)
+    }
+}
+
+/// Whether some screen holds part of the vertical edge at `x` that runs from
+/// `top` to `bottom`.
+fn covers_x(screens: &[Rect], x: f64, top: f64, bottom: f64) -> bool {
+    screens
+        .iter()
+        .any(|m| x >= m.x && x <= m.x + m.width && top < m.y + m.height && bottom > m.y)
+}
+
+/// Whether some screen holds part of the horizontal edge at `y` that runs
+/// from `left` to `right`.
+fn covers_y(screens: &[Rect], y: f64, left: f64, right: f64) -> bool {
+    screens
+        .iter()
+        .any(|m| y >= m.y && y <= m.y + m.height && left < m.x + m.width && right > m.x)
+}
+
+/// One axis of `WindowFrame::fitted_to`. The window runs from `start` for
+/// `len`; `covered` says whether some screen holds each end; `home` is the
+/// title bar screen's range on this axis. An uncovered end is pulled onto
+/// `home`, and the window shrinks (leaving `margin`, never below `min`) when
+/// it does not fit; a covered end may stay where it is, on another display.
+fn fit_axis(start: f64, len: f64, covered: (bool, bool), home: (f64, f64), margin: f64, min: f64) -> (f64, f64) {
+    if covered.0 && covered.1 {
+        return (start, len);
+    }
+    let lo = if covered.0 { start.min(home.0) } else { home.0 };
+    let hi = if covered.1 { (start + len).max(home.1) } else { home.1 };
+    let len = len.min(hi - lo - margin).max(min);
+    // `max` last: a window still too big for the screen keeps its start (the
+    // left edge, or the title bar) on screen rather than its end.
+    let start = start.min(hi - len).max(lo);
+    (start, len)
+}
+
+/// The first name an unreadable `desktop.json` can be moved to without
+/// replacing an earlier recovery copy: `desktop.json.corrupt`, then
+/// `desktop.json.corrupt.1` to `.9`, next to it.
+/// A name is free only when nothing at all is there: a file, a directory or
+/// a dangling symlink left at it is taken, and so is a name that cannot be
+/// checked. None when every name is taken.
+fn free_aside_name(path: &Path) -> Option<PathBuf> {
+    (0..ASIDE_SLOTS)
+        .map(|n| match n {
+            0 => path.with_extension("json.corrupt"),
+            n => path.with_extension(format!("json.corrupt.{n}")),
+        })
+        .find(|aside| matches!(fs::symlink_metadata(aside), Err(e) if e.kind() == io::ErrorKind::NotFound))
+}
+
+impl Config {
+    /// Where the config lives, or None if the OS has no config directory.
+    pub fn default_path() -> Option<PathBuf> {
+        dirs::config_dir().map(|d| d.join("Codeman").join("desktop.json"))
+    }
+
+    /// Read the config, and say whether saving back to `path` is safe this
+    /// run. A missing file is the default. A file that is there but cannot
+    /// be read (not UTF-8, no permission, a directory, an I/O error) or does
+    /// not parse is moved aside for recovery, and the defaults are used; it
+    /// is never silently overwritten with them. It goes to the first free
+    /// name of `desktop.json.corrupt`, `desktop.json.corrupt.1` to `.9`, so
+    /// a second unreadable file never replaces the copy kept from the first.
+    /// If every name is taken or the move fails, the answer is false: the
+    /// original is still at `path`, and the save at exit must not replace it.
+    pub fn load_from(path: &Path) -> (Config, bool) {
+        let text = match fs::read_to_string(path) {
+            Ok(text) => Some(text),
+            Err(e) if e.kind() == io::ErrorKind::NotFound => return (Config::default(), true),
+            Err(_) => None,
+        };
+        if let Some(mut config) = text.and_then(|t| serde_json::from_str::<Config>(&t).ok()) {
+            config.sanitize();
+            return (config, true);
+        }
+        let Some(aside) = free_aside_name(path) else {
+            eprintln!(
+                "codeman-desktop: {} could not be read, and {} to .{} are all taken; settings will not be saved this run",
+                path.display(),
+                path.with_extension("json.corrupt").display(),
+                ASIDE_SLOTS - 1
+            );
+            return (Config::default(), false);
+        };
+        match fs::rename(path, &aside) {
+            Ok(()) => {
+                eprintln!(
+                    "codeman-desktop: {} could not be read; moved it to {} and started with defaults",
+                    path.display(),
+                    aside.display()
+                );
+                (Config::default(), true)
+            }
+            Err(e) => {
+                eprintln!(
+                    "codeman-desktop: {} could not be read or moved aside ({e}); settings will not be saved this run",
+                    path.display()
+                );
+                (Config::default(), false)
+            }
+        }
+    }
+
+    /// Write via a temp file and rename, so a crash never leaves half a file.
+    pub fn save_to(&self, path: &Path) -> io::Result<()> {
+        if let Some(dir) = path.parent() {
+            fs::create_dir_all(dir)?;
+        }
+        let tmp = path.with_extension("json.tmp");
+        let text = serde_json::to_string_pretty(self).map_err(io::Error::other)?;
+        fs::write(&tmp, text)?;
+        fs::rename(&tmp, path)
+    }
+
+    fn sanitize(&mut self) {
+        let mut seen = std::collections::HashSet::new();
+        self.servers.retain(|s| !s.url.is_empty() && seen.insert(s.url.clone()));
+        self.servers.truncate(MAX_SERVERS);
+        self.window = self.window.and_then(WindowFrame::sanitized);
+    }
+
+    /// Move (or add) a server to the top of the recent list. Returns the
+    /// Keychain accounts, as (url, username), of the entries with a username
+    /// that fall off the end of the list (it keeps `MAX_SERVERS`), for the
+    /// caller to delete. A different username on `url` itself is not
+    /// reported: the caller deletes that account before it saves the new
+    /// one, comparing the names exactly as the Keychain account string
+    /// does. A delete made after the save could take the new password with
+    /// it on a Keychain that treats two spellings of a name as one item.
+    #[must_use = "the returned Keychain accounts must be deleted"]
+    pub fn remember(&mut self, url: &str, username: Option<&str>, saved: bool) -> Vec<(String, String)> {
+        self.servers.retain(|s| s.url != url);
+        self.servers.insert(
+            0,
+            ServerEntry {
+                url: url.to_string(),
+                username: username.map(str::to_string),
+                has_saved_password: saved,
+            },
+        );
+        let evicted = self.servers.split_off(self.servers.len().min(MAX_SERVERS));
+        evicted.into_iter().filter_map(|s| Some((s.url, s.username?))).collect()
+    }
+
+    pub fn forget(&mut self, url: &str) -> Option<ServerEntry> {
+        let idx = self.servers.iter().position(|s| s.url == url)?;
+        Some(self.servers.remove(idx))
+    }
+
+    pub fn find(&self, url: &str) -> Option<&ServerEntry> {
+        self.servers.iter().find(|s| s.url == url)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn tmp_dir(name: &str) -> PathBuf {
+        let dir = std::env::temp_dir().join(format!("codeman-desktop-test-{}-{name}", std::process::id()));
+        let _ = fs::remove_dir_all(&dir);
+        dir
+    }
+
+    fn frame(x: f64, y: f64, width: f64, height: f64) -> WindowFrame {
+        WindowFrame {
+            x,
+            y,
+            width,
+            height,
+            fullscreen: false,
+        }
+    }
+
+    fn rect(x: f64, y: f64, width: f64, height: f64) -> Rect {
+        Rect { x, y, width, height }
+    }
+
+    const MIN: (f64, f64) = (MIN_WIDTH, MIN_HEIGHT);
+
+    fn reachable(f: &WindowFrame, screens: &[Rect]) -> bool {
+        f.title_screen(screens).is_some()
+    }
+
+    /// The outer frame (title bar included) as left, top, right, bottom.
+    fn outer(f: &WindowFrame) -> (f64, f64, f64, f64) {
+        let top = f.y - TITLE_ABOVE_Y;
+        (f.x, top, f.x + f.width, top + TITLE_BAR + f.height)
+    }
+
+    #[test]
+    fn missing_file_is_default() {
+        let dir = tmp_dir("missing");
+        let (c, can_save) = Config::load_from(&dir.join("desktop.json"));
+        assert_eq!(c, Config::default());
+        assert!(c.auto_connect);
+        assert!(can_save);
+    }
+
+    #[test]
+    fn round_trip_and_atomic_save() {
+        let dir = tmp_dir("roundtrip");
+        let path = dir.join("nested").join("desktop.json");
+        let mut c = Config::default();
+        assert!(c.remember("http://127.0.0.1:3000/", None, false).is_empty());
+        assert!(c.remember("https://box.ts.net/", Some("admin"), true).is_empty());
+        c.start_fullscreen = true;
+        c.window = Some(WindowFrame {
+            x: 10.0,
+            y: 20.0,
+            width: 1200.0,
+            height: 800.0,
+            fullscreen: true,
+        });
+        c.save_to(&path).unwrap();
+        assert!(!path.with_extension("json.tmp").exists());
+        let (back, can_save) = Config::load_from(&path);
+        assert!(can_save);
+        assert_eq!(back, c);
+        assert_eq!(back.servers[0].url, "https://box.ts.net/");
+        let text = fs::read_to_string(&path).unwrap();
+        assert!(
+            !text.to_lowercase().contains("password\":\""),
+            "no password values on disk"
+        );
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn corrupt_file_is_moved_aside() {
+        let dir = tmp_dir("corrupt");
+        fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("desktop.json");
+        fs::write(&path, "{ not json").unwrap();
+        let (c, can_save) = Config::load_from(&path);
+        assert_eq!(c, Config::default());
+        assert!(can_save);
+        assert!(!path.exists());
+        assert!(dir.join("desktop.json.corrupt").exists());
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn non_utf8_file_is_moved_aside() {
+        let dir = tmp_dir("non-utf8");
+        fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("desktop.json");
+        // Valid JSON apart from a Latin-1 "ü", which is not UTF-8.
+        let bytes = b"{\"servers\":[{\"url\":\"http://a/\",\"username\":\"J\xfcrg\"}]}";
+        fs::write(&path, bytes).unwrap();
+        let (c, can_save) = Config::load_from(&path);
+        assert_eq!(c, Config::default());
+        assert!(can_save);
+        assert!(!path.exists());
+        assert_eq!(fs::read(dir.join("desktop.json.corrupt")).unwrap(), bytes);
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn unreadable_path_is_moved_aside() {
+        let dir = tmp_dir("unreadable");
+        let path = dir.join("desktop.json");
+        // A directory where the file should be: it exists but cannot be read.
+        fs::create_dir_all(path.join("inside")).unwrap();
+        let (c, can_save) = Config::load_from(&path);
+        assert_eq!(c, Config::default());
+        assert!(can_save);
+        assert!(!path.exists());
+        assert!(dir.join("desktop.json.corrupt").join("inside").is_dir());
+        c.save_to(&path).unwrap();
+        assert_eq!(Config::load_from(&path), (Config::default(), true));
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn second_corruption_keeps_the_first_copy() {
+        let dir = tmp_dir("corrupt-twice");
+        fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("desktop.json");
+        fs::write(&path, "{ first").unwrap();
+        assert_eq!(Config::load_from(&path), (Config::default(), true));
+        fs::write(&path, "{ second").unwrap();
+        assert_eq!(Config::load_from(&path), (Config::default(), true));
+        assert!(!path.exists());
+        assert_eq!(fs::read_to_string(dir.join("desktop.json.corrupt")).unwrap(), "{ first");
+        assert_eq!(
+            fs::read_to_string(dir.join("desktop.json.corrupt.1")).unwrap(),
+            "{ second"
+        );
+        // A good file written afterwards loads normally and moves nothing.
+        Config::default().save_to(&path).unwrap();
+        assert_eq!(Config::load_from(&path), (Config::default(), true));
+        assert!(!dir.join("desktop.json.corrupt.2").exists());
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn taken_aside_names_are_skipped() {
+        let dir = tmp_dir("aside-taken");
+        // A directory left at the first name and a file at the second: the
+        // third is the first free one.
+        fs::create_dir_all(dir.join("desktop.json.corrupt")).unwrap();
+        fs::write(dir.join("desktop.json.corrupt.1"), "kept").unwrap();
+        #[cfg(unix)]
+        std::os::unix::fs::symlink(dir.join("nowhere"), dir.join("desktop.json.corrupt.2")).unwrap();
+        let next = if cfg!(unix) {
+            "desktop.json.corrupt.3"
+        } else {
+            "desktop.json.corrupt.2"
+        };
+        let path = dir.join("desktop.json");
+        fs::write(&path, "{ not json").unwrap();
+        assert_eq!(Config::load_from(&path), (Config::default(), true));
+        assert!(!path.exists());
+        assert!(dir.join("desktop.json.corrupt").is_dir());
+        assert_eq!(fs::read_to_string(dir.join("desktop.json.corrupt.1")).unwrap(), "kept");
+        // The dangling symlink still points nowhere and still counts as taken.
+        #[cfg(unix)]
+        assert!(fs::symlink_metadata(dir.join("desktop.json.corrupt.2"))
+            .unwrap()
+            .is_symlink());
+        assert_eq!(fs::read_to_string(dir.join(next)).unwrap(), "{ not json");
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn no_free_aside_name_disables_saving() {
+        let dir = tmp_dir("aside-full");
+        fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("desktop.json");
+        let names: Vec<PathBuf> = std::iter::once(dir.join("desktop.json.corrupt"))
+            .chain((1..ASIDE_SLOTS).map(|n| dir.join(format!("desktop.json.corrupt.{n}"))))
+            .collect();
+        assert_eq!(names.len(), 10);
+        for (n, name) in names.iter().enumerate() {
+            fs::write(name, format!("copy {n}")).unwrap();
+        }
+        fs::write(&path, "{ not json").unwrap();
+        assert_eq!(Config::load_from(&path), (Config::default(), false));
+        assert_eq!(fs::read_to_string(&path).unwrap(), "{ not json");
+        for (n, name) in names.iter().enumerate() {
+            assert_eq!(fs::read_to_string(name).unwrap(), format!("copy {n}"));
+        }
+        assert!(!dir.join("desktop.json.corrupt.10").exists());
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn failed_move_aside_disables_saving() {
+        use std::os::unix::fs::PermissionsExt;
+        let dir = tmp_dir("stuck");
+        fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("desktop.json");
+        fs::write(&path, "{ not json").unwrap();
+        fs::set_permissions(&dir, fs::Permissions::from_mode(0o555)).unwrap();
+        // Root ignores the read-only directory, so the rename cannot fail.
+        if fs::write(dir.join("probe"), "").is_ok() {
+            eprintln!("skipped: the directory is still writable (running as root?)");
+            fs::set_permissions(&dir, fs::Permissions::from_mode(0o755)).unwrap();
+            let _ = fs::remove_dir_all(&dir);
+            return;
+        }
+        let (c, can_save) = Config::load_from(&path);
+        fs::set_permissions(&dir, fs::Permissions::from_mode(0o755)).unwrap();
+        assert_eq!(c, Config::default());
+        assert!(!can_save);
+        assert_eq!(fs::read_to_string(&path).unwrap(), "{ not json");
+        assert!(!dir.join("desktop.json.corrupt").exists());
+        let _ = fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn recent_list_is_deduped_and_capped() {
+        let mut c = Config::default();
+        for i in 0..12 {
+            assert!(c.remember(&format!("http://h{i}/"), None, false).is_empty());
+        }
+        assert!(c.remember("http://h5/", Some("me"), false).is_empty());
+        assert_eq!(c.servers.len(), MAX_SERVERS);
+        assert_eq!(c.servers[0].url, "http://h5/");
+        assert_eq!(c.servers.iter().filter(|s| s.url == "http://h5/").count(), 1);
+        assert_eq!(c.forget("http://h5/").unwrap().username.as_deref(), Some("me"));
+        assert!(c.find("http://h5/").is_none());
+    }
+
+    #[test]
+    fn remember_leaves_a_username_change_to_the_caller() {
+        let url = "https://box.ts.net/";
+        let mut c = Config::default();
+        assert!(c.remember(url, Some("Alice"), true).is_empty());
+        // Every change of the username on the same server, a case-only one,
+        // another user, or none at all, returns nothing: the caller deletes
+        // the old account before it saves the new one.
+        for (user, saved) in [
+            (Some("alice"), true),
+            (Some(" alice "), true),
+            (Some("bob"), true),
+            (None, false),
+            (None, false),
+            (Some("dave"), true),
+        ] {
+            assert!(c.remember(url, user, saved).is_empty(), "{user:?}");
+            let entry = c.find(url).unwrap();
+            assert_eq!((entry.username.as_deref(), entry.has_saved_password), (user, saved));
+            assert_eq!(c.servers.iter().filter(|s| s.url == url).count(), 1);
+        }
+        assert!(c.remember("http://other/", Some("carol"), true).is_empty());
+        assert!(c.remember(url, Some("erin"), true).is_empty());
+        assert_eq!(c.servers.len(), 2);
+        assert_eq!(c.servers[0].url, url);
+        assert_eq!(c.find("http://other/").unwrap().username.as_deref(), Some("carol"));
+    }
+
+    #[test]
+    fn remember_returns_evicted_accounts() {
+        let mut c = Config::default();
+        for i in 0..MAX_SERVERS {
+            let user = (i % 2 == 0).then(|| format!("u{i}"));
+            assert!(c.remember(&format!("http://h{i}/"), user.as_deref(), true).is_empty());
+        }
+        // Moving a listed server to the top evicts nothing.
+        assert!(c.remember("http://h3/", None, false).is_empty());
+        assert_eq!(c.servers.len(), MAX_SERVERS);
+        // A new server pushes the oldest (h0, with a username) off the end.
+        assert_eq!(
+            c.remember("http://new/", None, false),
+            vec![("http://h0/".to_string(), "u0".to_string())]
+        );
+        // The next oldest is h1, which has no username: nothing to delete.
+        assert!(c.remember("http://newer/", Some("x"), true).is_empty());
+        assert_eq!(c.servers.len(), MAX_SERVERS);
+        assert!(c.find("http://h0/").is_none() && c.find("http://h1/").is_none());
+        // A username change on a listed server returns nothing; the next new
+        // server evicts the oldest entry, and only that account comes back.
+        let mut c = Config::default();
+        for i in 0..MAX_SERVERS {
+            assert!(c.remember(&format!("http://h{i}/"), Some("u"), true).is_empty());
+        }
+        assert!(c.remember("http://h7/", Some("v"), true).is_empty());
+        assert_eq!(
+            c.remember("http://h8/", Some("w"), true),
+            vec![("http://h0/".to_string(), "u".to_string())]
+        );
+        assert_eq!(c.find("http://h7/").unwrap().username.as_deref(), Some("v"));
+        assert_eq!(c.servers.len(), MAX_SERVERS);
+    }
+
+    #[test]
+    fn unknown_and_missing_fields_tolerated() {
+        let c: Config = serde_json::from_str(r#"{"servers":[{"url":"http://a/"}],"future":1}"#).unwrap();
+        assert!(c.auto_connect);
+        assert_eq!(c.servers[0].username, None);
+    }
+
+    #[test]
+    fn a_bad_window_frame_keeps_the_servers() {
+        for (name, window) in [
+            ("missing-height", r#"{"x":1,"y":2,"width":3}"#),
+            ("not-a-frame", r#""maximized""#),
+            ("null-number", r#"{"x":null,"y":2,"width":3,"height":4}"#),
+        ] {
+            let dir = tmp_dir(&format!("bad-window-{name}"));
+            fs::create_dir_all(&dir).unwrap();
+            let path = dir.join("desktop.json");
+            fs::write(
+                &path,
+                format!(r#"{{"servers":[{{"url":"http://a/"}}],"autoConnect":false,"window":{window}}}"#),
+            )
+            .unwrap();
+            let (c, can_save) = Config::load_from(&path);
+            assert!(can_save, "{name}");
+            assert_eq!(c.servers.len(), 1, "{name}");
+            assert!(!c.auto_connect, "{name}");
+            assert_eq!(c.window, None, "{name}");
+            // The file was read, so it stays where it is.
+            assert!(path.is_file(), "{name}");
+            assert!(!path.with_extension("json.corrupt").exists(), "{name}");
+        }
+        // A whole frame and an absent one read as before.
+        let c: Config =
+            serde_json::from_str(r#"{"window":{"x":1,"y":2,"width":900,"height":600,"fullscreen":true}}"#).unwrap();
+        assert_eq!(c.window.map(|f| (f.width, f.fullscreen)), Some((900.0, true)));
+        assert_eq!(serde_json::from_str::<Config>("{}").unwrap().window, None);
+        assert_eq!(
+            serde_json::from_str::<Config>(r#"{"window":null}"#).unwrap().window,
+            None
+        );
+    }
+
+    #[test]
+    fn first_run_window_sits_between_the_menu_bar_and_the_dock() {
+        let screen = |width: f64, height: f64| Rect {
+            x: 0.0,
+            y: 0.0,
+            width,
+            height,
+        };
+        let size = (1280.0, 820.0);
+        let min = (480.0, 360.0);
+        // A 13 inch MacBook: the window is shortened, and ends above the Dock.
+        let f = WindowFrame::first_run(&screen(1440.0, 900.0), size, min);
+        assert_eq!((f.width, f.height), (1280.0, 744.0));
+        assert_eq!((f.x, f.y), (80.0, 66.0));
+        assert!(f.y + f.height <= 900.0 - 90.0);
+        // A large display: the full size, centred across and in the free height.
+        let f = WindowFrame::first_run(&screen(2560.0, 1440.0), size, min);
+        assert_eq!((f.width, f.height), (1280.0, 820.0));
+        assert_eq!(f.x, 640.0);
+        assert_eq!(f.y - 66.0, 1440.0 - 90.0 - (f.y + f.height));
+        // A second display to the left of the first.
+        let left = Rect {
+            x: -1920.0,
+            y: 120.0,
+            width: 1920.0,
+            height: 1080.0,
+        };
+        let f = WindowFrame::first_run(&left, size, min);
+        assert_eq!(f.x, -1920.0 + 320.0);
+        assert!(f.y >= 120.0 + 66.0 && f.y + f.height <= 120.0 + 1080.0 - 90.0);
+        // Never smaller than the minimum, on a display too small for it too.
+        let f = WindowFrame::first_run(&screen(500.0, 400.0), size, min);
+        assert_eq!((f.width, f.height), min);
+        assert!(!f.fullscreen);
+    }
+
+    #[test]
+    fn frame_sanitizing_and_reachability() {
+        assert!(frame(f64::NAN, 0.0, 800.0, 600.0).sanitized().is_none());
+        let small = frame(0.0, 0.0, 10.0, 10.0).sanitized().unwrap();
+        assert_eq!((small.width, small.height), (MIN_WIDTH, MIN_HEIGHT));
+        let screen = [rect(0.0, 0.0, 1512.0, 982.0)];
+        let on = frame(100.0, 50.0, 1200.0, 800.0);
+        assert!(reachable(&on, &screen));
+        assert_eq!(on.fitted_to(&screen, MIN), Some(on));
+        let off = frame(3000.0, 50.0, 1200.0, 800.0);
+        assert!(!reachable(&off, &screen));
+        assert_eq!(off.fitted_to(&screen, MIN), None);
+        let above = frame(100.0, -900.0, 1200.0, 800.0);
+        assert!(!reachable(&above, &screen));
+        assert_eq!(above.fitted_to(&screen, MIN), None);
+        // Only a sliver of the title bar on screen is not enough to grab.
+        let sliver = frame(-1150.0, 50.0, 1200.0, 800.0);
+        assert!(!reachable(&sliver, &screen));
+        assert_eq!(sliver.fitted_to(&screen, MIN), None);
+        // No screens at all (none reported): nothing is reachable.
+        assert_eq!(on.fitted_to(&[], MIN), None);
+    }
+
+    #[test]
+    fn title_bar_is_above_y_on_macos() {
+        let screen = [rect(0.0, 0.0, 1512.0, 982.0)];
+        // On macOS the title bar of a content top at y = 10 is at -18..10,
+        // mostly above the screen; elsewhere it is at 10..38.
+        let high = frame(100.0, 10.0, 1200.0, 800.0);
+        assert_eq!(reachable(&high, &screen), !cfg!(target_os = "macos"));
+        // Half the bar above the top edge: still grabbable, and fitting
+        // brings all of it onto the screen.
+        let straddling = frame(100.0, TITLE_ABOVE_Y - 10.0, 1200.0, 800.0);
+        assert!(reachable(&straddling, &screen));
+        let fitted = straddling.fitted_to(&screen, MIN).unwrap();
+        assert_eq!(outer(&fitted).1, 0.0);
+        assert_eq!((fitted.x, fitted.width, fitted.height), (100.0, 1200.0, 800.0));
+    }
+
+    #[test]
+    fn frame_from_an_unplugged_ultrawide_is_fitted() {
+        // Saved on a 3440x1440 display at the origin, restored on a laptop.
+        let laptop = [rect(0.0, 0.0, 1512.0, 982.0)];
+        let wide = frame(0.0, 30.0, 3300.0, 1300.0);
+        let fitted = wide.fitted_to(&laptop, MIN).unwrap();
+        assert_eq!(
+            (fitted.x, fitted.y, fitted.width, fitted.height),
+            (0.0, 30.0, 1512.0 - FIT_MARGIN_X, 982.0 - FIT_MARGIN_Y)
+        );
+        let (left, top, right, bottom) = outer(&fitted);
+        assert!(left >= 0.0 && top >= 0.0 && right <= 1512.0 && bottom <= 982.0);
+        // Hanging off the right of the laptop by a bit: shifted, not shrunk.
+        let fitted = frame(500.0, 100.0, 1200.0, 700.0).fitted_to(&laptop, MIN).unwrap();
+        assert_eq!(
+            (fitted.x, fitted.y, fitted.width, fitted.height),
+            (312.0, 100.0, 1200.0, 700.0)
+        );
+        // Hanging off the left: shifted right.
+        let fitted = frame(-1000.0, 100.0, 1200.0, 700.0).fitted_to(&laptop, MIN).unwrap();
+        assert_eq!((fitted.x, fitted.width), (0.0, 1200.0));
+    }
+
+    #[test]
+    fn frame_spanning_two_displays_is_left_alone() {
+        let screens = [rect(0.0, 0.0, 1512.0, 982.0), rect(1512.0, -200.0, 2560.0, 1440.0)];
+        let span = frame(1000.0, 100.0, 1500.0, 700.0);
+        assert_eq!(span.fitted_to(&screens, MIN), Some(span));
+        // Only the edge that lands on no display moves: the left edge stays
+        // on the laptop, the right edge comes back onto the external one.
+        let past = frame(1000.0, 100.0, 3500.0, 700.0);
+        let fitted = past.fitted_to(&screens, MIN).unwrap();
+        assert_eq!(fitted.x, 1000.0);
+        assert_eq!(fitted.x + fitted.width, 1512.0 + 2560.0 - FIT_MARGIN_X);
+        assert_eq!((fitted.y, fitted.height), (100.0, 700.0));
+    }
+
+    #[test]
+    fn fitted_frame_keeps_the_minimum_size() {
+        let tiny = [rect(0.0, 0.0, 400.0, 300.0)];
+        let fitted = frame(0.0, 40.0, 1200.0, 800.0).fitted_to(&tiny, MIN).unwrap();
+        assert_eq!((fitted.width, fitted.height), MIN);
+        // Too big for the screen even at the minimum: the left edge and the
+        // title bar stay on it.
+        let (left, top, _, _) = outer(&fitted);
+        assert_eq!((left, top), (0.0, 0.0));
+        assert!(reachable(&fitted, &tiny));
+        // The fullscreen flag rides along.
+        let full = WindowFrame {
+            fullscreen: true,
+            ..frame(0.0, 40.0, 1200.0, 800.0)
+        };
+        assert!(full.fitted_to(&tiny, MIN).unwrap().fullscreen);
+    }
+}

packages/desktop/src/credentials.rs

@@ -0,0 +1,354 @@
+//! Saved passwords, in the macOS Keychain (service "Codeman Desktop", one item
+//! per username + server). Nothing secret is ever written to the config file.
+//! Windows and Linux get their stores when those builds land.
+//!
+//! Every Keychain call runs on ONE long-lived worker thread, never on the
+//! event loop: any of them can bring up the system's access prompt (an
+//! ad-hoc build's items name the previous build), and the window must keep
+//! running while it is up. One serial worker rather than a thread per call,
+//! because jobs must run in the order they were asked for: a delete from
+//! Forget that ran after a later save of the same account would remove the
+//! password that was just saved.
+
+use std::sync::mpsc::{self, Receiver, Sender};
+use std::thread::{self, JoinHandle};
+
+pub const SERVICE: &str = "Codeman Desktop";
+
+/// What a job reports when the worker thread is gone.
+const WORKER_GONE: &str = "The Keychain could not be reached.";
+
+/// The Keychain account name for a username on a server.
+pub fn account(server_url: &str, username: &str) -> String {
+    format!("{username} @ {server_url}")
+}
+
+/// The password store the worker runs jobs against: the Keychain on macOS,
+/// a stub elsewhere, an in-memory map in the tests.
+trait Backend: Send {
+    fn load(&mut self, account: &str) -> Option<String>;
+    fn save(&mut self, account: &str, password: &str) -> Result<(), String>;
+    fn delete(&mut self, account: &str);
+}
+
+enum Job {
+    Load {
+        account: String,
+        reply: Sender<Option<String>>,
+    },
+    Save {
+        account: String,
+        password: String,
+        reply: Sender<Result<(), String>>,
+    },
+    Delete {
+        account: String,
+    },
+    /// Ends the worker, so the tests can check what callers see after it.
+    #[cfg(test)]
+    Stop,
+}
+
+/// A handle on the Keychain worker. Start it once with [`Keychain::spawn`]
+/// and clone the handle: every clone feeds the same queue, which is what
+/// keeps jobs in order. The worker ends when the last handle is dropped.
+#[derive(Clone)]
+pub struct Keychain {
+    jobs: Sender<Job>,
+}
+
+impl Keychain {
+    /// Starts the worker. If the thread cannot be started, the handle still
+    /// works and every call fails soft (no password, save refused).
+    pub fn spawn() -> Keychain {
+        start(Box::new(imp::System)).0
+    }
+
+    /// The saved password for an account. Blocks until every job queued
+    /// before it has run and the Keychain has answered, which can mean
+    /// waiting on the access prompt, so call it from a worker thread.
+    /// `None` when nothing is saved, the item is unreadable or the worker
+    /// is gone.
+    pub fn load_blocking(&self, account: &str) -> Option<String> {
+        let (reply, answer) = mpsc::channel();
+        let job = Job::Load {
+            account: account.to_owned(),
+            reply,
+        };
+        self.jobs.send(job).ok()?;
+        answer.recv().ok().flatten()
+    }
+
+    /// Saves a password, replacing any saved before. Blocks like
+    /// [`Keychain::load_blocking`]; the result is the Keychain's own.
+    pub fn save_blocking(&self, account: &str, password: &str) -> Result<(), String> {
+        let (reply, answer) = mpsc::channel();
+        let job = Job::Save {
+            account: account.to_owned(),
+            password: password.to_owned(),
+            reply,
+        };
+        if self.jobs.send(job).is_err() {
+            return Err(WORKER_GONE.into());
+        }
+        answer.recv().unwrap_or_else(|_| Err(WORKER_GONE.into()))
+    }
+
+    /// Queues the removal of an account's password and returns at once.
+    /// Jobs queued after it see the account gone. Nothing happens when the
+    /// worker is gone.
+    pub fn delete(&self, account: &str) {
+        let _ = self.jobs.send(Job::Delete {
+            account: account.to_owned(),
+        });
+    }
+}
+
+/// Starts a worker on `backend`. The join handle is for the tests; `None`
+/// when the thread could not be started, in which case the receiver went
+/// down with the closure and every send fails.
+fn start(backend: Box<dyn Backend>) -> (Keychain, Option<JoinHandle<()>>) {
+    let (jobs, queue) = mpsc::channel();
+    let worker = thread::Builder::new()
+        .name("keychain".into())
+        .spawn(move || run(backend, queue))
+        .ok();
+    (Keychain { jobs }, worker)
+}
+
+/// The worker loop: one job at a time, in the order they were sent, until
+/// every handle is gone. A reply nobody waits for any more is dropped.
+fn run(mut backend: Box<dyn Backend>, queue: Receiver<Job>) {
+    for job in queue {
+        match job {
+            Job::Load { account, reply } => {
+                let _ = reply.send(backend.load(&account));
+            }
+            Job::Save {
+                account,
+                password,
+                reply,
+            } => {
+                let _ = reply.send(backend.save(&account, &password));
+            }
+            Job::Delete { account } => backend.delete(&account),
+            #[cfg(test)]
+            Job::Stop => return,
+        }
+    }
+}
+
+#[cfg(target_os = "macos")]
+mod imp {
+    use super::{Backend, SERVICE};
+    use objc2::rc::autoreleasepool;
+    use security_framework::passwords::{delete_generic_password, get_generic_password, set_generic_password};
+
+    /// The login Keychain, through security-framework. The worker lives as
+    /// long as the app and a thread's implicit autorelease pool drains only
+    /// when the thread ends, so each call gets its own pool and whatever
+    /// Security autoreleases is freed with the job.
+    pub struct System;
+
+    impl Backend for System {
+        fn load(&mut self, account: &str) -> Option<String> {
+            autoreleasepool(|_| {
+                get_generic_password(SERVICE, account)
+                    .ok()
+                    .and_then(|b| String::from_utf8(b).ok())
+            })
+        }
+
+        fn save(&mut self, account: &str, password: &str) -> Result<(), String> {
+            autoreleasepool(|_| set_generic_password(SERVICE, account, password.as_bytes()).map_err(|e| e.to_string()))
+        }
+
+        fn delete(&mut self, account: &str) {
+            autoreleasepool(|_| {
+                let _ = delete_generic_password(SERVICE, account);
+            })
+        }
+    }
+}
+
+#[cfg(not(target_os = "macos"))]
+mod imp {
+    use super::Backend;
+
+    /// No password store yet on this platform.
+    pub struct System;
+
+    impl Backend for System {
+        fn load(&mut self, _account: &str) -> Option<String> {
+            None
+        }
+        fn save(&mut self, _account: &str, _password: &str) -> Result<(), String> {
+            Err("Saving passwords is not supported on this platform yet.".into())
+        }
+        fn delete(&mut self, _account: &str) {}
+    }
+}
+
+/// A Keychain on an in-memory store, for these tests and for the tests of the
+/// code that uses a Keychain (main.rs).
+#[cfg(test)]
+pub(crate) mod memory {
+    use super::{start, Backend, Keychain};
+    use std::collections::HashMap;
+    use std::sync::{Arc, Mutex};
+    use std::time::Duration;
+
+    /// An in-memory store that logs every job it runs. Its delete is slow on
+    /// purpose: a queue that did not keep order would let the next job
+    /// overtake it, and the tests would see that.
+    #[derive(Clone, Default)]
+    pub(crate) struct Memory {
+        items: Arc<Mutex<HashMap<String, String>>>,
+        log: Arc<Mutex<Vec<String>>>,
+    }
+
+    impl Memory {
+        fn note(&self, entry: String) {
+            self.log.lock().unwrap().push(entry);
+        }
+        /// The jobs the store ran, in order.
+        pub(crate) fn log(&self) -> Vec<String> {
+            self.log.lock().unwrap().clone()
+        }
+    }
+
+    impl Backend for Memory {
+        fn load(&mut self, account: &str) -> Option<String> {
+            self.note(format!("load {account}"));
+            self.items.lock().unwrap().get(account).cloned()
+        }
+        fn save(&mut self, account: &str, password: &str) -> Result<(), String> {
+            self.note(format!("save {account}"));
+            self.items
+                .lock()
+                .unwrap()
+                .insert(account.to_owned(), password.to_owned());
+            Ok(())
+        }
+        fn delete(&mut self, account: &str) {
+            std::thread::sleep(Duration::from_millis(30));
+            self.note(format!("delete {account}"));
+            self.items.lock().unwrap().remove(account);
+        }
+    }
+
+    /// A worker on a fresh store, and the store to look into.
+    pub(crate) fn keychain() -> (Keychain, Memory) {
+        let memory = Memory::default();
+        let (keychain, worker) = start(Box::new(memory.clone()));
+        assert!(worker.is_some(), "the worker thread starts");
+        (keychain, memory)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::memory::{keychain, Memory};
+    use super::{start, Backend, Job, Keychain};
+
+    /// A store whose load fails the way a crashed worker would.
+    struct Crashes;
+
+    impl Backend for Crashes {
+        fn load(&mut self, _account: &str) -> Option<String> {
+            panic!("keychain worker crashed");
+        }
+        fn save(&mut self, _account: &str, _password: &str) -> Result<(), String> {
+            Ok(())
+        }
+        fn delete(&mut self, _account: &str) {}
+    }
+
+    #[test]
+    fn account_names_are_per_user_and_server() {
+        assert_eq!(
+            super::account("http://127.0.0.1:3000/", "admin"),
+            "admin @ http://127.0.0.1:3000/"
+        );
+        assert_ne!(
+            super::account("http://a/", "admin"),
+            super::account("http://b/", "admin")
+        );
+    }
+
+    #[test]
+    fn a_load_reads_what_a_save_wrote() {
+        let (keychain, _) = keychain();
+        assert_eq!(keychain.load_blocking("a"), None);
+        assert_eq!(keychain.save_blocking("a", "secret"), Ok(()));
+        assert_eq!(keychain.load_blocking("a").as_deref(), Some("secret"));
+        assert_eq!(keychain.save_blocking("a", "changed"), Ok(()));
+        assert_eq!(keychain.load_blocking("a").as_deref(), Some("changed"));
+        assert_eq!(keychain.load_blocking("b"), None);
+    }
+
+    #[test]
+    fn a_delete_queued_before_a_save_never_removes_the_saved_password() {
+        let (keychain, memory) = keychain();
+        assert_eq!(keychain.save_blocking("a", "old"), Ok(()));
+        keychain.delete("a");
+        assert_eq!(keychain.save_blocking("a", "new"), Ok(()));
+        assert_eq!(keychain.load_blocking("a").as_deref(), Some("new"));
+        assert_eq!(memory.log(), ["save a", "delete a", "save a", "load a"]);
+    }
+
+    #[test]
+    fn a_delete_queued_after_a_save_removes_it_before_the_next_job() {
+        let (keychain, memory) = keychain();
+        assert_eq!(keychain.save_blocking("a", "secret"), Ok(()));
+        keychain.delete("a");
+        // No wait between the two: the load is queued behind the delete.
+        assert_eq!(keychain.load_blocking("a"), None);
+        assert_eq!(memory.log(), ["save a", "delete a", "load a"]);
+    }
+
+    #[test]
+    fn jobs_from_clones_on_other_threads_share_one_queue() {
+        let (keychain, memory) = keychain();
+        let other = keychain.clone();
+        std::thread::spawn(move || {
+            other.save_blocking("a", "secret").unwrap();
+            other.delete("a");
+        })
+        .join()
+        .unwrap();
+        assert_eq!(keychain.load_blocking("a"), None);
+        assert_eq!(memory.log(), ["save a", "delete a", "load a"]);
+    }
+
+    #[test]
+    fn every_call_fails_soft_once_the_worker_is_gone() {
+        let memory = Memory::default();
+        let (keychain, worker) = start(Box::new(memory.clone()));
+        assert_eq!(keychain.save_blocking("a", "secret"), Ok(()));
+        keychain.jobs.send(Job::Stop).unwrap();
+        worker.unwrap().join().unwrap();
+
+        assert_eq!(keychain.load_blocking("a"), None);
+        assert!(keychain.save_blocking("a", "secret").is_err());
+        keychain.delete("a");
+        keychain.clone().delete("a");
+        assert_eq!(memory.log(), ["save a"]);
+    }
+
+    #[cfg(panic = "unwind")]
+    #[test]
+    fn a_worker_that_dies_mid_job_answers_nothing_and_takes_no_more_jobs() {
+        let (keychain, worker) = start(Box::new(Crashes));
+        assert_eq!(keychain.load_blocking("a"), None);
+        assert!(worker.unwrap().join().is_err(), "the worker panicked");
+        assert!(keychain.save_blocking("a", "secret").is_err());
+        keychain.delete("a");
+    }
+
+    #[test]
+    fn the_handle_is_send_and_sync() {
+        fn send_sync_clone<T: Send + Sync + Clone + 'static>() {}
+        send_sync_clone::<Keychain>();
+    }
+}

packages/desktop/src/local_server.rs

@@ -0,0 +1,827 @@
+//! "Start Codeman on this Mac": `codeman web -d` through the user's login shell.
+//!
+//! A double-clicked app gets launchd's bare PATH (`/usr/bin:/bin:...`), which
+//! finds neither `codeman` nor `node`, and the server inherits whatever
+//! environment it is started with: every session it spawns looks for
+//! claude/codex/tmux on that PATH and reads provider keys from it. So the
+//! command runs with the login shell's environment, picking up Homebrew and the
+//! user's profile, and falls back to the interactive profile (`-i`) for setups
+//! that only extend PATH there (nvm in `.zshrc`). The URL's port and base path
+//! are passed as separate arguments (`"$@"`), never spliced into the script text.
+//!
+//! How depends on the shell, chosen by its basename as Codeman's own
+//! `src/utils/shell-resolver.ts` does:
+//! - A POSIX shell (zsh, bash, sh, ...) runs `SCRIPT` itself:
+//!   `$SHELL -l [-i] -c SCRIPT codeman-desktop <args>`.
+//! - Any other shell (fish, nu, xonsh, elvish, pwsh, tcsh) cannot parse
+//!   `SCRIPT`: fish has no `then`/`fi` and refuses `$@`. It is only asked to
+//!   print its environment between two markers, and `SCRIPT` then runs under
+//!   `/bin/sh` with exactly that environment.
+//!
+//! `codeman web -d` refuses to start a second server on the same data dir and
+//! returns once the new one answers `/api/status`, so this is safe to call
+//! only after the probe found nothing listening.
+
+use std::io::Read;
+use std::path::{Path, PathBuf};
+use std::process::{Command, Stdio};
+use std::sync::mpsc;
+use std::time::{Duration, Instant};
+use url::Url;
+
+use crate::policy;
+
+/// For the whole start, every shell run and retry included.
+const TIMEOUT: Duration = Duration::from_secs(60);
+
+/// How long the pipes may stay open after the shell exited. Something the
+/// profile started in the background can inherit them and keep them open for
+/// as long as it runs; whatever arrived by then is used.
+const PIPE_GRACE: Duration = Duration::from_secs(2);
+
+/// Found on PATH first, then the `install.sh` clone at `~/.codeman/app`.
+const SCRIPT: &str = r#"if command -v codeman >/dev/null 2>&1; then exec codeman "$@"; fi
+if [ -f "$HOME/.codeman/app/dist/index.js" ] && command -v node >/dev/null 2>&1; then
+  exec node "$HOME/.codeman/app/dist/index.js" "$@"
+fi
+echo "Could not find the codeman command or ~/.codeman/app. Install Codeman first: https://github.com/Ark0N/Codeman#install" >&2
+exit 127"#;
+
+/// Bracket the environment a non-POSIX login shell prints, so whatever its
+/// profile writes to stdout before or after cannot be read as a variable.
+const ENV_BEGIN: &str = "__CODEMAN_DESKTOP_ENV_BEGIN__";
+const ENV_END: &str = "__CODEMAN_DESKTOP_ENV_END__";
+
+/// What a non-POSIX login shell runs to report its environment. The shell
+/// itself only parses a command path and one single-quoted word with no `;`,
+/// `$`, backslash or `!` in it, so fish, nu, xonsh, elvish, pwsh and tcsh have
+/// no syntax of their own to disagree on. The markers and `env` run under
+/// `/bin/sh`, which inherits everything the profile exported.
+fn capture_command() -> String {
+    format!("/bin/sh -c 'echo {ENV_BEGIN}; /usr/bin/env; echo {ENV_END}'")
+}
+
+fn login_shell() -> PathBuf {
+    std::env::var_os("SHELL")
+        .map(PathBuf::from)
+        .filter(|p| p.is_absolute() && p.exists())
+        .unwrap_or_else(|| PathBuf::from("/bin/zsh"))
+}
+
+/// How the login shell takes part in a start.
+#[derive(Debug, PartialEq, Eq)]
+enum Flavor {
+    /// Runs `SCRIPT` itself.
+    Posix,
+    /// Only reports its environment. One entry per attempt, in order: a later
+    /// one runs when the earlier one printed no environment or its environment
+    /// had no `codeman` (exit 127).
+    Capture(&'static [&'static [&'static str]]),
+}
+
+fn flavor(shell: &Path) -> Flavor {
+    match shell.file_name().and_then(|n| n.to_str()).unwrap_or("") {
+        "sh" | "bash" | "zsh" | "dash" | "ksh" | "ash" | "ksh93" | "mksh" | "pdksh" => Flavor::Posix,
+        // tcsh honors -l only when it is the ONLY flag, so a login shell that
+        // also runs a command is impossible; -i at least reads all of .tcshrc
+        // (csh: .cshrc), including the parts guarded by `$?prompt`.
+        "csh" | "tcsh" => Flavor::Capture(&[&["-ic"]]),
+        _ => Flavor::Capture(&[&["-l", "-c"], &["-l", "-i", "-c"]]),
+    }
+}
+
+/// What one process printed, stdout and stderr kept apart.
+struct Output {
+    code: Option<i32>,
+    stdout: String,
+    stderr: String,
+}
+
+/// What `codeman` (or `SCRIPT` failing to find it) said, for the connect page.
+struct Run {
+    code: Option<i32>,
+    output: String,
+}
+
+impl From<Output> for Run {
+    fn from(out: Output) -> Self {
+        let mut output = out.stdout;
+        if !out.stderr.trim().is_empty() {
+            // On a line of its own, also when stdout ended without a newline.
+            if !output.is_empty() && !output.ends_with('\n') {
+                output.push('\n');
+            }
+            output.push_str(&out.stderr);
+        }
+        Run {
+            code: out.code,
+            output: last_lines(&output, 6),
+        }
+    }
+}
+
+/// Copy `pipe` into the channel as it arrives, tagged with `stream`, then send
+/// `None` once it closes.
+fn pump<R: Read + Send + 'static>(pipe: Option<R>, stream: usize, tx: mpsc::Sender<(usize, Option<Vec<u8>>)>) {
+    std::thread::spawn(move || {
+        if let Some(mut pipe) = pipe {
+            let mut buf = [0u8; 8192];
+            loop {
+                match pipe.read(&mut buf) {
+                    Ok(0) => break,
+                    Ok(n) => {
+                        if tx.send((stream, Some(buf[..n].to_vec()))).is_err() {
+                            return;
+                        }
+                    }
+                    Err(e) if e.kind() == std::io::ErrorKind::Interrupted => continue,
+                    Err(_) => break,
+                }
+            }
+        }
+        let _ = tx.send((stream, None));
+    });
+}
+
+/// Run `cmd` to completion with stdin closed, or kill it at `deadline`.
+fn exec(mut cmd: Command, deadline: Instant) -> Result<Output, String> {
+    cmd.stdin(Stdio::null()).stdout(Stdio::piped()).stderr(Stdio::piped());
+    let mut child = cmd
+        .spawn()
+        .map_err(|e| format!("Could not run {}: {e}", Path::new(cmd.get_program()).display()))?;
+
+    // Read both pipes on threads so a chatty profile cannot fill one and stall.
+    let (tx, rx) = mpsc::channel();
+    pump(child.stdout.take(), 0, tx.clone());
+    pump(child.stderr.take(), 1, tx);
+
+    // A login shell usually answers within tens of milliseconds: look often
+    // at first, then back off.
+    let mut nap = Duration::from_millis(5);
+    let status = loop {
+        match child.try_wait() {
+            Ok(Some(status)) => break status,
+            Ok(None) if Instant::now() < deadline => {
+                std::thread::sleep(nap);
+                nap = (nap * 2).min(Duration::from_millis(100));
+            }
+            Ok(None) => {
+                let _ = child.kill();
+                let _ = child.wait();
+                return Err("Starting Codeman took longer than a minute; it was stopped.".into());
+            }
+            Err(e) => return Err(e.to_string()),
+        }
+    };
+
+    let mut bufs = [Vec::new(), Vec::new()];
+    let settle = (Instant::now() + PIPE_GRACE).min(deadline);
+    let mut open = 2;
+    while open > 0 {
+        match rx.recv_timeout(settle.saturating_duration_since(Instant::now())) {
+            Ok((stream, Some(bytes))) => bufs[stream].extend_from_slice(&bytes),
+            Ok((_, None)) => open -= 1,
+            Err(_) => {
+                // Still held open past the grace: keep what already arrived.
+                for (stream, bytes) in rx.try_iter() {
+                    if let Some(bytes) = bytes {
+                        bufs[stream].extend_from_slice(&bytes);
+                    }
+                }
+                break;
+            }
+        }
+    }
+    // Lossy rather than strict: one stray non-UTF-8 byte in a profile's output
+    // must not cost the whole environment.
+    let [out, err] = bufs;
+    Ok(Output {
+        code: status.code(),
+        stdout: String::from_utf8_lossy(&out).into_owned(),
+        stderr: String::from_utf8_lossy(&err).into_owned(),
+    })
+}
+
+/// The tail of what the command printed, for the connect page.
+fn last_lines(text: &str, n: usize) -> String {
+    let lines: Vec<&str> = text
+        .lines()
+        .map(str::trim_end)
+        .filter(|l| !l.trim().is_empty())
+        .collect();
+    lines[lines.len().saturating_sub(n)..].join("\n")
+}
+
+/// The variables `env` printed between the markers, or None when the output
+/// does not hold both. A line that does not start with a portable variable
+/// name followed by `=` continues the previous value (a value with a newline
+/// in it); one that does starts the next variable.
+fn parse_env(output: &str) -> Option<Vec<(String, String)>> {
+    let mut lines = output.split('\n');
+    // ends_with: a profile line printed without its newline sits in front.
+    lines.by_ref().find(|l| l.trim_end().ends_with(ENV_BEGIN))?;
+    let mut vars: Vec<(String, String)> = Vec::new();
+    for line in lines {
+        if line.trim() == ENV_END {
+            return Some(vars);
+        }
+        match env_entry(line) {
+            Some((name, value)) => vars.push((name.to_string(), value.to_string())),
+            None => {
+                if let Some((_, value)) = vars.last_mut() {
+                    value.push('\n');
+                    value.push_str(line);
+                }
+            }
+        }
+    }
+    None
+}
+
+fn env_entry(line: &str) -> Option<(&str, &str)> {
+    let (name, value) = line.split_once('=')?;
+    let mut chars = name.chars();
+    let first = chars.next()?;
+    let portable =
+        (first.is_ascii_alphabetic() || first == '_') && chars.all(|c| c.is_ascii_alphanumeric() || c == '_');
+    portable.then_some((name, value))
+}
+
+/// Ask `shell` for its environment with `flags`. The outer error ends the
+/// start (the shell could not be run, or time is up); the inner one means this
+/// form printed no environment and the next may be tried.
+fn capture_env(
+    shell: &Path,
+    flags: &[&str],
+    deadline: Instant,
+) -> Result<Result<Vec<(String, String)>, String>, String> {
+    let mut cmd = Command::new(shell);
+    cmd.args(flags).arg(capture_command());
+    let out = exec(cmd, deadline)?;
+    Ok(parse_env(&out.stdout).ok_or_else(|| {
+        // stderr only: stdout can hold part of the environment, API keys included.
+        let said = last_lines(&out.stderr, 6);
+        let mut message = format!("Could not read the environment of your login shell {}", shell.display());
+        if said.is_empty() {
+            let code = out
+                .code
+                .map_or_else(|| "a signal".to_string(), |c| format!("exit code {c}"));
+            message.push_str(&format!(" (it ended with {code})."));
+        } else {
+            message.push_str(":\n");
+            message.push_str(&said);
+        }
+        message
+    }))
+}
+
+/// Run `cmd` in the home folder, where a terminal and the LaunchAgent start
+/// Codeman too. The server keeps the directory it was started in and uses it
+/// as the default for a session that names none; an app opened from the Finder
+/// or the Dock runs in `/`.
+fn in_home(cmd: &mut Command) {
+    if let Some(home) = dirs::home_dir() {
+        cmd.current_dir(home);
+    }
+}
+
+/// `script` (SCRIPT or FIND_SCRIPT) under `/bin/sh` with exactly the captured
+/// environment, so the server gets the profile's PATH, API keys and CODEMAN_*
+/// settings and nothing of launchd's bare one.
+fn run_with_env(script: &str, env: &[(String, String)], args: &[String], deadline: Instant) -> Result<Run, String> {
+    let mut cmd = Command::new("/bin/sh");
+    cmd.arg("-c").arg(script).arg("codeman-desktop").args(args);
+    cmd.env_clear().envs(env.iter().map(|(k, v)| (k, v)));
+    in_home(&mut cmd);
+    exec(cmd, deadline).map(Run::from)
+}
+
+/// `script` run by the POSIX login shell itself.
+fn run_in_shell(
+    script: &str,
+    shell: &Path,
+    interactive: bool,
+    args: &[String],
+    deadline: Instant,
+) -> Result<Run, String> {
+    let mut cmd = Command::new(shell);
+    cmd.arg("-l");
+    if interactive {
+        cmd.arg("-i");
+    }
+    cmd.arg("-c").arg(script).arg("codeman-desktop").args(args);
+    in_home(&mut cmd);
+    exec(cmd, deadline).map(Run::from)
+}
+
+/// Run `script` the way the login shell allows (see the module docs). Exit
+/// 127 means "no codeman here" and moves on to the next way of asking; the
+/// interactive profile is asked only when `interactive` allows it.
+fn launch(script: &str, shell: &Path, args: &[String], deadline: Instant, interactive: bool) -> Result<Run, String> {
+    let attempts = match flavor(shell) {
+        Flavor::Posix => {
+            let result = run_in_shell(script, shell, false, args, deadline)?;
+            if result.code != Some(127) || !interactive {
+                return Ok(result);
+            }
+            // Not on the login PATH; try the interactive profile too.
+            return run_in_shell(script, shell, true, args, deadline);
+        }
+        Flavor::Capture(attempts) => attempts,
+    };
+    let mut last_run = None;
+    let mut capture_error = None;
+    let interactive_flag = |flags: &&&[&str]| {
+        flags
+            .iter()
+            .any(|f| f.starts_with('-') && !f.starts_with("--") && f.contains('i'))
+    };
+    for flags in attempts.iter().filter(|f| interactive || !interactive_flag(f)) {
+        match capture_env(shell, flags, deadline)? {
+            Ok(env) => {
+                let result = run_with_env(script, &env, args, deadline)?;
+                if result.code != Some(127) {
+                    return Ok(result);
+                }
+                last_run = Some(result);
+            }
+            Err(e) => capture_error = Some(e),
+        }
+    }
+    if let Some(result) = last_run {
+        return Ok(result);
+    }
+    // No form printed an environment: a shell that knows neither -l nor -i
+    // may still run a bare -c.
+    match capture_env(shell, &["-c"], deadline)? {
+        Ok(env) => run_with_env(script, &env, args, deadline),
+        Err(e) => Err(capture_error.unwrap_or(e)),
+    }
+}
+
+/// Exit 0 when SCRIPT would find Codeman (the `codeman` command or the
+/// `install.sh` clone), 127 when it would not. Same lookup, nothing started.
+const FIND_SCRIPT: &str = r#"if command -v codeman >/dev/null 2>&1; then exit 0; fi
+if [ -f "$HOME/.codeman/app/dist/index.js" ] && command -v node >/dev/null 2>&1; then exit 0; fi
+exit 127"#;
+
+/// How long the This Mac tab waits for the login shell to answer whether
+/// Codeman is installed.
+const FIND_TIMEOUT: Duration = Duration::from_secs(15);
+
+/// `installed` with the shell given, so tests need not touch `$SHELL`.
+fn installed_with(shell: &Path, interactive: bool) -> bool {
+    matches!(
+        launch(FIND_SCRIPT, shell, &[], Instant::now() + FIND_TIMEOUT, interactive),
+        Ok(Run { code: Some(0), .. })
+    )
+}
+
+/// Whether "Start Codeman on this Mac" would find Codeman: the `codeman`
+/// command on the login shell's PATH, or `~/.codeman/app` with `node`. Runs
+/// the login shell, so never on the event loop. `interactive` also asks the
+/// interactive profile (nvm in `.zshrc`, say), whose side effects only a
+/// user's own click should set off.
+pub fn installed(interactive: bool) -> bool {
+    installed_with(&login_shell(), interactive)
+}
+
+/// `start` with the shell given, so tests need not touch `$SHELL`.
+fn start_with(shell: &Path, args: &[String]) -> Result<String, String> {
+    let result = launch(SCRIPT, shell, args, Instant::now() + TIMEOUT, true)?;
+    match result.code {
+        Some(0) => Ok(result.output),
+        _ if result.output.is_empty() => Err("codeman web -d failed without saying why.".into()),
+        _ => Err(result.output),
+    }
+}
+
+/// Start a detached server for `url`. Ok carries what `codeman` printed.
+pub fn start(url: &Url) -> Result<String, String> {
+    if !policy::can_start_locally(url) {
+        return Err("Codeman can only be started here for http://127.0.0.1 or http://localhost on this Mac.".into());
+    }
+    start_with(&login_shell(), &policy::start_args(url))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// One spawning test at a time. A test writes a fake executable and then
+    /// runs it; a process forked by a parallel test in between can still hold
+    /// the write descriptor, and the exec then fails with ETXTBSY.
+    fn serial() -> std::sync::MutexGuard<'static, ()> {
+        static LOCK: std::sync::Mutex<()> = std::sync::Mutex::new(());
+        LOCK.lock().unwrap_or_else(|e| e.into_inner())
+    }
+
+    #[test]
+    fn tail_of_output() {
+        assert_eq!(last_lines("a\n\nb\nc\n", 2), "b\nc");
+        assert_eq!(last_lines("", 3), "");
+    }
+
+    #[test]
+    fn stderr_starts_on_a_line_of_its_own() {
+        let said = |stdout: &str, stderr: &str| {
+            Run::from(Output {
+                code: Some(1),
+                stdout: stdout.into(),
+                stderr: stderr.into(),
+            })
+            .output
+        };
+        // stdout that ended without a newline used to be glued to stderr.
+        assert_eq!(
+            said("Starting Codeman", "Error: port 3000 is in use\n"),
+            "Starting Codeman\nError: port 3000 is in use"
+        );
+        assert_eq!(said("Starting\n", "Error\n"), "Starting\nError");
+        assert_eq!(said("", "Error\n"), "Error");
+        assert_eq!(said("Started\n", "  \n"), "Started");
+    }
+
+    #[test]
+    fn refuses_non_local_or_https() {
+        assert!(start(&Url::parse("https://127.0.0.1:3000/").unwrap()).is_err());
+        assert!(start(&Url::parse("http://192.168.1.4:3000/").unwrap()).is_err());
+    }
+
+    /// The script passes its arguments through untouched and reports a missing
+    /// `codeman` with exit 127 (run with an empty PATH and HOME so nothing is found).
+    #[test]
+    fn script_reports_missing_codeman() {
+        let _serial = serial();
+        let out = Command::new("/bin/sh")
+            .arg("-c")
+            .arg(SCRIPT)
+            .arg("codeman-desktop")
+            .args(["web", "-d", "--port", "3000"])
+            .env("PATH", "/nonexistent")
+            .env("HOME", "/nonexistent")
+            .output()
+            .unwrap();
+        assert_eq!(out.status.code(), Some(127));
+        assert!(String::from_utf8_lossy(&out.stderr).contains("Could not find the codeman command"));
+    }
+
+    /// Arguments are data: a hostile-looking value is passed as one argv entry
+    /// to a fake `codeman`, never run by the shell.
+    #[test]
+    fn arguments_are_not_shell_text() {
+        let _serial = serial();
+        let dir = std::env::temp_dir().join(format!("codeman-desktop-fake-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let fake = dir.join("codeman");
+        std::fs::write(&fake, "#!/bin/sh\nfor a in \"$@\"; do printf '[%s]' \"$a\"; done\n").unwrap();
+        #[cfg(unix)]
+        {
+            use std::os::unix::fs::PermissionsExt;
+            std::fs::set_permissions(&fake, std::fs::Permissions::from_mode(0o755)).unwrap();
+        }
+        let out = Command::new("/bin/sh")
+            .arg("-c")
+            .arg(SCRIPT)
+            .arg("codeman-desktop")
+            .args(["web", "--base-url", "/x; touch /tmp/pwned"])
+            .env("PATH", format!("{}:/usr/bin:/bin", dir.display()))
+            .output()
+            .unwrap();
+        assert_eq!(
+            String::from_utf8_lossy(&out.stdout),
+            "[web][--base-url][/x; touch /tmp/pwned]"
+        );
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
+    fn pairs(vars: &[(&str, &str)]) -> Vec<(String, String)> {
+        vars.iter().map(|(k, v)| (k.to_string(), v.to_string())).collect()
+    }
+
+    #[test]
+    fn env_capture_parser() {
+        let out = format!(
+            "Welcome to fish, the friendly interactive shell\nno newline here{ENV_BEGIN}\n\
+             PATH=/opt/homebrew/bin:/usr/bin:/bin\n\
+             MULTI=line one\nline two\n  three = 3\n\
+             EMPTY=\n\
+             TRAIL=a \n\n\
+             _=/usr/bin/env\n\
+             {ENV_END}  \nbye from the profile\nNOT_CAPTURED=1\n"
+        );
+        assert_eq!(
+            parse_env(&out),
+            Some(pairs(&[
+                ("PATH", "/opt/homebrew/bin:/usr/bin:/bin"),
+                ("MULTI", "line one\nline two\n  three = 3"),
+                ("EMPTY", ""),
+                ("TRAIL", "a \n"),
+                ("_", "/usr/bin/env"),
+            ]))
+        );
+        // A value may itself contain `=`; only the first one splits.
+        assert_eq!(
+            parse_env(&format!("{ENV_BEGIN}\nOPTS=a=b\n{ENV_END}\n")),
+            Some(pairs(&[("OPTS", "a=b")]))
+        );
+        assert_eq!(parse_env(&format!("{ENV_BEGIN}\n{ENV_END}\n")), Some(vec![]));
+        assert_eq!(parse_env(&format!("{ENV_BEGIN}\nPATH=/usr/bin\n")), None);
+        assert_eq!(parse_env(&format!("PATH=/usr/bin\n{ENV_END}\n")), None);
+        assert_eq!(parse_env("fish: Unknown command: then\n"), None);
+    }
+
+    #[test]
+    fn shell_flavor_by_basename() {
+        for posix in [
+            "/bin/zsh",
+            "/bin/bash",
+            "/bin/sh",
+            "/bin/dash",
+            "/bin/ksh",
+            "/opt/homebrew/bin/bash",
+        ] {
+            assert_eq!(flavor(Path::new(posix)), Flavor::Posix, "{posix}");
+        }
+        assert_eq!(flavor(Path::new("/bin/tcsh")), Flavor::Capture(&[&["-ic"]]));
+        assert_eq!(flavor(Path::new("/bin/csh")), Flavor::Capture(&[&["-ic"]]));
+        for other in [
+            "/opt/homebrew/bin/fish",
+            "/usr/local/bin/nu",
+            "/opt/homebrew/bin/xonsh",
+            "/usr/local/bin/pwsh",
+        ] {
+            assert_eq!(
+                flavor(Path::new(other)),
+                Flavor::Capture(&[&["-l", "-c"], &["-l", "-i", "-c"]]),
+                "{other}"
+            );
+        }
+    }
+
+    /// The login shell's part avoids everything only POSIX shells read.
+    #[test]
+    fn capture_command_is_shell_neutral() {
+        let _serial = serial();
+        let cmd = capture_command();
+        for bad in ["then", "fi", "$", "\\", "!", "\"", "&&"] {
+            assert!(!cmd.contains(bad), "{bad} in {cmd}");
+        }
+        assert_eq!(cmd.matches('\'').count(), 2);
+        assert!(cmd.starts_with("/bin/sh -c '"));
+        // /bin/sh, as the capture runs it, prints a parsable environment.
+        let out = Command::new("/bin/sh")
+            .arg("-c")
+            .arg(&cmd)
+            .env("CODEMAN_DESKTOP_PARSER_PROBE", "two\nlines")
+            .output()
+            .unwrap();
+        let env = parse_env(&String::from_utf8_lossy(&out.stdout)).expect("markers");
+        assert!(env
+            .iter()
+            .any(|(k, v)| k == "CODEMAN_DESKTOP_PARSER_PROBE" && v == "two\nlines"));
+        assert!(env.iter().any(|(k, _)| k == "PATH"));
+    }
+
+    /// A scratch directory with a fake `codeman` in `bin/` that prints its
+    /// arguments, the profile's marker variable and the names of everything in
+    /// its environment.
+    struct Scratch(PathBuf);
+
+    impl Scratch {
+        fn new(name: &str) -> Self {
+            let dir = std::env::temp_dir().join(format!("codeman-desktop-{name}-{}", std::process::id()));
+            let _ = std::fs::remove_dir_all(&dir);
+            std::fs::create_dir_all(dir.join("bin")).unwrap();
+            std::fs::create_dir_all(dir.join("home")).unwrap();
+            let scratch = Scratch(dir);
+            scratch.exe(
+                "bin/codeman",
+                "#!/bin/sh\nprintf '[%s]' \"$@\"; echo\necho \"profile: $CODEMAN_DESKTOP_TEST\"\n\
+                 printf 'names:'; env | cut -d= -f1 | tr '\\n' ' '; echo\n",
+            );
+            scratch
+        }
+
+        /// Write an executable at `rel`, with `DIR` in `body` replaced by the scratch path.
+        fn exe(&self, rel: &str, body: &str) -> PathBuf {
+            let path = self.0.join(rel);
+            std::fs::write(&path, body.replace("DIR", &self.0.display().to_string())).unwrap();
+            #[cfg(unix)]
+            {
+                use std::os::unix::fs::PermissionsExt;
+                std::fs::set_permissions(&path, std::fs::Permissions::from_mode(0o755)).unwrap();
+            }
+            path
+        }
+
+        fn argv_log(&self) -> String {
+            std::fs::read_to_string(self.0.join("argv.log")).unwrap_or_default()
+        }
+    }
+
+    impl Drop for Scratch {
+        fn drop(&mut self) {
+            let _ = std::fs::remove_dir_all(&self.0);
+        }
+    }
+
+    const HOSTILE_ARGS: [&str; 3] = ["web", "--base-url", "/x; touch /tmp/pwned"];
+
+    fn hostile_args() -> Vec<String> {
+        HOSTILE_ARGS.iter().map(|s| s.to_string()).collect()
+    }
+
+    /// A stand-in for fish: it refuses POSIX `then` and `$@` the way fish
+    /// does, logs its flags, prints profile noise around whatever it runs, and
+    /// its "profile" replaces the environment. On its interactive form only
+    /// when `INTERACTIVE_ONLY` is yes, PATH reaches the fake `codeman`.
+    const FAKE_FISH: &str = r#"#!/bin/sh
+args=""
+for a in "$@"; do
+  case "$a" in
+    *then*|*'$@'*) echo "fish: Unknown command: then" >&2; exit 127;;
+    -*) args="$args$a ";;
+  esac
+  cmd="$a"
+done
+echo "$args" >> "DIR/argv.log"
+bin="DIR/bin"
+case "INTERACTIVE_ONLY:$args" in yes:*-i*|no:*) ;; *) bin=/nonexistent;; esac
+echo "Welcome to fish, the friendly interactive shell"
+/usr/bin/env -i PATH="$bin:/usr/bin:/bin" HOME="DIR/home" CODEMAN_DESKTOP_TEST="from the profile" /bin/sh -c "$cmd"
+echo "bye from the profile"
+"#;
+
+    /// SCRIPT never reaches the non-POSIX shell: it runs under /bin/sh with the
+    /// environment the shell printed, and with nothing else.
+    #[test]
+    fn non_posix_shell_only_reports_its_environment() {
+        let _serial = serial();
+        let s = Scratch::new("fish");
+        let fish = s.exe("fish", &FAKE_FISH.replace("INTERACTIVE_ONLY", "no"));
+        let out = start_with(&fish, &hostile_args()).expect("started");
+        let lines: Vec<&str> = out.lines().collect();
+        assert_eq!(lines[0], "[web][--base-url][/x; touch /tmp/pwned]");
+        assert_eq!(lines[1], "profile: from the profile");
+        assert_eq!(s.argv_log(), "-l -c \n");
+
+        // env_clear: a variable this process has, but the profile did not
+        // export, must not reach codeman.
+        let names: Vec<&str> = lines[2].trim_start_matches("names:").split_whitespace().collect();
+        assert!(names.contains(&"PATH") && names.contains(&"CODEMAN_DESKTOP_TEST"));
+        let captured = ["PATH", "HOME", "CODEMAN_DESKTOP_TEST", "PWD", "OLDPWD", "SHLVL", "_"];
+        let leaked: Vec<String> = std::env::vars_os()
+            .filter_map(|(k, _)| k.into_string().ok())
+            .filter(|k| !captured.contains(&k.as_str()) && !k.starts_with("__CF"))
+            .filter(|k| names.contains(&k.as_str()))
+            .collect();
+        assert!(leaked.is_empty(), "leaked from the app: {leaked:?}");
+    }
+
+    /// No codeman on the login PATH (exit 127): the environment is captured
+    /// again from the interactive profile, and that run finds it.
+    #[test]
+    fn non_posix_shell_retries_with_the_interactive_profile() {
+        let _serial = serial();
+        let s = Scratch::new("fish-retry");
+        let fish = s.exe("fish", &FAKE_FISH.replace("INTERACTIVE_ONLY", "yes"));
+        let out = start_with(&fish, &hostile_args()).expect("started");
+        assert!(out.starts_with("[web][--base-url][/x; touch /tmp/pwned]\n"), "{out}");
+        assert_eq!(s.argv_log(), "-l -c \n-l -i -c \n");
+    }
+
+    /// tcsh takes -l only as its only flag, so it is asked with -ic alone.
+    #[test]
+    fn tcsh_gets_ic_and_never_l() {
+        let _serial = serial();
+        let s = Scratch::new("tcsh");
+        let tcsh = s.exe(
+            "tcsh",
+            r#"#!/bin/sh
+echo "$*" >> "DIR/argv.log"
+if [ "$#" != 2 ] || [ "$1" != -ic ]; then echo "tcsh: Unknown option: $1" >&2; exit 1; fi
+/usr/bin/env -i PATH="DIR/bin:/usr/bin:/bin" HOME="DIR/home" CODEMAN_DESKTOP_TEST=tcsh /bin/sh -c "$2"
+"#,
+        );
+        let out = start_with(&tcsh, &hostile_args()).expect("started");
+        assert!(out.contains("profile: tcsh"), "{out}");
+        assert_eq!(s.argv_log().lines().count(), 1);
+        assert!(s.argv_log().starts_with("-ic /bin/sh -c '"));
+    }
+
+    /// A shell that takes neither -l nor -i still gets a bare -c.
+    #[test]
+    fn shell_without_login_flags_falls_back_to_plain_c() {
+        let _serial = serial();
+        let s = Scratch::new("nolflag");
+        let shell = s.exe(
+            "elvish",
+            r#"#!/bin/sh
+echo "$1" >> "DIR/argv.log"
+case "$1" in -l|-i) echo "flag provided but not defined: $1" >&2; exit 2;; esac
+/usr/bin/env -i PATH="DIR/bin:/usr/bin:/bin" HOME="DIR/home" CODEMAN_DESKTOP_TEST=plain /bin/sh -c "$2"
+"#,
+        );
+        let out = start_with(&shell, &hostile_args()).expect("started");
+        assert!(out.contains("profile: plain"), "{out}");
+        assert_eq!(s.argv_log(), "-l\n-l\n-c\n");
+    }
+
+    /// A shell that never prints its environment is reported by name with what
+    /// it said on stderr, never with stdout (which can carry secrets).
+    #[test]
+    fn capture_failure_names_the_shell() {
+        let _serial = serial();
+        let s = Scratch::new("broken");
+        let shell = s.exe(
+            "weirdsh",
+            "#!/bin/sh\necho 'API_KEY=sk-secret'\necho 'weirdsh: cannot start' >&2\nexit 3\n",
+        );
+        let err = start_with(&shell, &hostile_args()).unwrap_err();
+        assert!(err.contains("Could not read the environment"), "{err}");
+        assert!(err.contains("weirdsh: cannot start"), "{err}");
+        assert!(!err.contains("sk-secret"), "{err}");
+    }
+
+    /// POSIX shells keep running SCRIPT themselves: `-l -c SCRIPT codeman-desktop
+    /// args`, then `-l -i -c` when the login PATH had no codeman.
+    #[test]
+    fn posix_shell_runs_script_itself_and_retries_interactive() {
+        let _serial = serial();
+        let s = Scratch::new("zsh");
+        let zsh = s.exe(
+            "zsh",
+            r#"#!/bin/sh
+[ "$1" = -l ] || exit 90
+shift
+PATH=/usr/bin:/bin
+if [ "$1" = -i ]; then shift; PATH="DIR/bin:/usr/bin:/bin"; fi
+[ "$1" = -c ] || exit 91
+shift
+echo "$2" >> "DIR/argv.log"
+HOME="DIR/home"
+export PATH HOME
+exec /bin/sh -c "$@"
+"#,
+        );
+        let out = start_with(&zsh, &hostile_args()).expect("started");
+        assert!(out.starts_with("[web][--base-url][/x; touch /tmp/pwned]\n"), "{out}");
+        // $0 of the script, once per run: login, then interactive.
+        assert_eq!(s.argv_log(), "codeman-desktop\ncodeman-desktop\n");
+    }
+
+    /// The installed check asks the same shells the same way and runs nothing:
+    /// found on the interactive PATH here, after the login PATH had none.
+    #[test]
+    fn installed_check_finds_codeman_without_running_it() {
+        let _serial = serial();
+        let s = Scratch::new("find-zsh");
+        let zsh = s.exe(
+            "zsh",
+            r#"#!/bin/sh
+[ "$1" = -l ] || exit 90
+shift
+PATH=/usr/bin:/bin
+if [ "$1" = -i ]; then shift; PATH="DIR/bin:/usr/bin:/bin"; fi
+[ "$1" = -c ] || exit 91
+shift
+echo "$2" >> "DIR/argv.log"
+HOME="DIR/home"
+export PATH HOME
+exec /bin/sh -c "$@"
+"#,
+        );
+        // A codeman that would leave a mark if it ran.
+        s.exe("bin/codeman", "#!/bin/sh\ntouch DIR/ran\n");
+        // Without the interactive profile: one login-shell look, not found.
+        assert!(!installed_with(&zsh, false));
+        assert_eq!(s.argv_log(), "codeman-desktop\n");
+        assert!(installed_with(&zsh, true));
+        assert_eq!(s.argv_log(), "codeman-desktop\ncodeman-desktop\ncodeman-desktop\n");
+        assert!(!s.0.join("ran").exists(), "the installed check ran codeman");
+    }
+
+    /// Nothing on any PATH and no ~/.codeman/app: not installed. Through a
+    /// non-POSIX shell too, which only reports its environment.
+    #[test]
+    fn installed_check_reports_missing_codeman() {
+        let _serial = serial();
+        let s = Scratch::new("find-fish");
+        std::fs::remove_file(s.0.join("bin/codeman")).unwrap();
+        let fish = s.exe("fish", &FAKE_FISH.replace("INTERACTIVE_ONLY", "no"));
+        assert!(!installed_with(&fish, true));
+        // The login-only look asks fish once, with -l and never -i.
+        let before = s.argv_log();
+        assert!(!installed_with(&fish, false));
+        assert_eq!(&s.argv_log()[before.len()..], "-l -c \n");
+
+        // The install.sh clone counts once node is there.
+        let app = s.0.join("home/.codeman/app/dist");
+        std::fs::create_dir_all(&app).unwrap();
+        std::fs::write(app.join("index.js"), "").unwrap();
+        s.exe("bin/node", "#!/bin/sh\nexit 0\n");
+        assert!(installed_with(&fish, true));
+        assert!(installed_with(&fish, false));
+    }
+}

packages/desktop/src/probe.rs

@@ -0,0 +1,770 @@
+//! "Is a Codeman server answering at this address, and does it want a login?"
+//!
+//! One `GET <server>/api/status`, five seconds at most, run off the UI thread.
+//! The answer is classified into something the connect page can explain. It is
+//! asked once per user action, never in a loop: Codeman counts a request
+//! without valid credentials against the login rate limit (10 per IP).
+
+use serde::Serialize;
+use std::time::Duration;
+use url::Url;
+
+const TIMEOUT: Duration = Duration::from_secs(5);
+const MAX_BODY: u64 = 8 * 1024 * 1024;
+
+/// The path the probe asks for, relative to the server's base URL.
+const STATUS_PATH: &str = "api/status";
+
+/// rustls' text for `Error::InvalidCertificate`, which is what a handshake
+/// with a certificate the OS does not trust fails with. ureq hands it over as
+/// an `io::Error` of kind `InvalidData`, so the text is all there is to match
+/// without a direct rustls dependency.
+const CERT_REJECTED_PREFIX: &str = "invalid peer certificate";
+
+/// std's text for a failed `getaddrinfo`. Its kind is `Uncategorized`, which
+/// cannot be matched on stable Rust, so the prefix is the only handle. The
+/// prefix is the same on macOS and Linux; only the resolver's reason differs.
+const LOOKUP_FAILED_PREFIX: &str = "failed to lookup address information";
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+#[serde(tag = "kind", rename_all = "camelCase")]
+pub enum ProbeOutcome {
+    Ok {
+        version: String,
+    },
+    /// 401 and we sent no credentials.
+    NeedsLogin,
+    /// 401 although we sent credentials.
+    BadCredentials,
+    /// 429: too many failed logins from this address. A single-user Codeman
+    /// still accepts the right password, so the page needs to know whether
+    /// this probe carried one. `retry_after_secs` is the server's
+    /// `Retry-After`, when it gave one in seconds.
+    #[serde(rename_all = "camelCase")]
+    RateLimited {
+        sent_credentials: bool,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        retry_after_secs: Option<u64>,
+    },
+    /// 403 `PASSWORD_CHANGE_REQUIRED`: the credentials are valid, but a
+    /// multi-user Codeman wants this account's password changed first. Page
+    /// loads are exempt, so the web UI can show its change-password dialog.
+    PasswordChangeRequired,
+    /// 403 from Codeman's Host guard (a name it does not know, e.g. a custom domain).
+    HostNotAllowed,
+    /// 3xx. `location` is the target resolved against the probed URL.
+    /// `suggested` is a server address to use instead, set only when the
+    /// redirect stays on the same host, only moves to https or another port,
+    /// and still points at the status API. Never followed: a second request
+    /// would carry the credentials to an address the user did not type.
+    Redirect {
+        location: String,
+        suggested: Option<String>,
+    },
+    /// Something answered, but not Codeman's status API.
+    NotCodeman {
+        status: u16,
+    },
+    Refused,
+    /// No route to the address: the machine is off or on another network,
+    /// or macOS's Local Network privacy setting blocked the app.
+    Unreachable,
+    /// An http:// probe whose connection was closed without an answer. A
+    /// Codeman started with `--https` does exactly that to plain HTTP.
+    MaybeHttps,
+    Timeout,
+    TlsUntrusted {
+        detail: String,
+    },
+    Unresolvable,
+    Failed {
+        detail: String,
+    },
+}
+
+/// Classify an HTTP answer to `<server>/api/status`. `request` is the URL that
+/// was asked, `location` and `retry_after` are those response headers.
+pub fn classify_response(
+    request: &Url,
+    status: u16,
+    location: Option<&str>,
+    retry_after: Option<&str>,
+    sent_credentials: bool,
+    body: &str,
+) -> ProbeOutcome {
+    match status {
+        200 => {
+            let parsed: Option<serde_json::Value> = serde_json::from_str(body).ok();
+            let version = parsed.as_ref().and_then(|v| {
+                (v.get("success")? == &serde_json::Value::Bool(true))
+                    .then(|| v.get("data")?.get("version")?.as_str().map(str::to_string))
+                    .flatten()
+            });
+            match version {
+                Some(version) => ProbeOutcome::Ok { version },
+                None => ProbeOutcome::NotCodeman { status },
+            }
+        }
+        300..=399 => {
+            // A 3xx without a usable Location (304, a garbled header) is not a
+            // redirect anyone can act on.
+            match location.and_then(|l| request.join(l.trim()).ok()) {
+                Some(target) => ProbeOutcome::Redirect {
+                    suggested: suggested_server(request, &target),
+                    location: target.into(),
+                },
+                None => ProbeOutcome::NotCodeman { status },
+            }
+        }
+        401 if sent_credentials => ProbeOutcome::BadCredentials,
+        401 => ProbeOutcome::NeedsLogin,
+        403 if body.contains("host not allowed") => ProbeOutcome::HostNotAllowed,
+        // Codeman only says this after the Basic credentials verified (the
+        // probe sends no cookie), so without credentials it is not Codeman's
+        // answer to us, and loading the page without them would not help.
+        403 if sent_credentials && error_code(body).as_deref() == Some("PASSWORD_CHANGE_REQUIRED") => {
+            ProbeOutcome::PasswordChangeRequired
+        }
+        429 => ProbeOutcome::RateLimited {
+            sent_credentials,
+            retry_after_secs: retry_after.and_then(|v| v.trim().parse::<u64>().ok()),
+        },
+        other => ProbeOutcome::NotCodeman { status: other },
+    }
+}
+
+/// `errorCode` of a Codeman `ApiResponse` error body.
+fn error_code(body: &str) -> Option<String> {
+    let parsed: serde_json::Value = serde_json::from_str(body).ok()?;
+    Some(parsed.get("errorCode")?.as_str()?.to_string())
+}
+
+/// The server base URL a redirect points to, when it is the same server
+/// moved to https or another port (a reverse proxy upgrading plain HTTP, the
+/// usual case). Anything else, such as another host (a login gateway the
+/// window could not pass anyway) or a downgrade to http, gets no suggestion.
+fn suggested_server(request: &Url, target: &Url) -> Option<String> {
+    let upgrade = request.scheme() == "http" && target.scheme() == "https";
+    let port_change =
+        request.scheme() == target.scheme() && request.port_or_known_default() != target.port_or_known_default();
+    if !(upgrade || port_change) || target.host() != request.host() {
+        return None;
+    }
+    if !target.username().is_empty() || target.password().is_some() {
+        return None;
+    }
+    // The redirect must keep pointing at the status API (a proxy may add a
+    // base path in front of it); the base is what comes before it.
+    if !target.path().ends_with(request.path()) || !request.path().ends_with(STATUS_PATH) {
+        return None;
+    }
+    let base_path = &target.path()[..target.path().len() - STATUS_PATH.len()];
+    let mut base = target.clone();
+    base.set_path(base_path);
+    base.set_query(None);
+    base.set_fragment(None);
+    Some(base.into())
+}
+
+/// Transport failures, reduced to what the connect page explains differently.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum TransportError {
+    Refused,
+    Unreachable,
+    ClosedWithoutAnswer,
+    Timeout,
+    Tls(String),
+    Dns,
+    Other(String),
+}
+
+pub fn classify_transport(err: TransportError) -> ProbeOutcome {
+    match err {
+        TransportError::Refused => ProbeOutcome::Refused,
+        TransportError::Unreachable => ProbeOutcome::Unreachable,
+        TransportError::ClosedWithoutAnswer => ProbeOutcome::MaybeHttps,
+        TransportError::Timeout => ProbeOutcome::Timeout,
+        TransportError::Tls(detail) => ProbeOutcome::TlsUntrusted { detail },
+        TransportError::Dns => ProbeOutcome::Unresolvable,
+        TransportError::Other(detail) => ProbeOutcome::Failed { detail },
+    }
+}
+
+/// `plain_http`: the probe went to an http:// URL. Only there does a closed
+/// connection hint at an https-only server; over https the same close is a
+/// failed handshake with nothing more to say about it.
+fn transport_error(err: &ureq::Error, plain_http: bool) -> TransportError {
+    use std::io::ErrorKind;
+    match err {
+        ureq::Error::Timeout(_) => TransportError::Timeout,
+        ureq::Error::HostNotFound => TransportError::Dns,
+        ureq::Error::ConnectionFailed => TransportError::Refused,
+        // ureq passes both a rejected certificate (rustls wraps it as
+        // InvalidData during the handshake) and a failed name lookup (std's
+        // own error) through as plain io errors, so they are told apart here
+        // before the kinds below swallow them.
+        ureq::Error::Io(e) if e.kind() == ErrorKind::InvalidData && e.to_string().starts_with(CERT_REJECTED_PREFIX) => {
+            TransportError::Tls(e.to_string())
+        }
+        ureq::Error::Io(e) if e.raw_os_error().is_none() && e.to_string().starts_with(LOOKUP_FAILED_PREFIX) => {
+            TransportError::Dns
+        }
+        ureq::Error::Io(e) => match e.kind() {
+            ErrorKind::ConnectionRefused | ErrorKind::ConnectionReset | ErrorKind::AddrNotAvailable => {
+                TransportError::Refused
+            }
+            ErrorKind::HostUnreachable | ErrorKind::NetworkUnreachable => TransportError::Unreachable,
+            ErrorKind::UnexpectedEof if plain_http => TransportError::ClosedWithoutAnswer,
+            ErrorKind::TimedOut | ErrorKind::WouldBlock => TransportError::Timeout,
+            _ => TransportError::Other(e.to_string()),
+        },
+        // ureq's own rustls errors come from setting up the TLS client (the
+        // handshake's arrive as Io above); only a certificate rejection is
+        // "untrusted", anything else is reported as it is.
+        ureq::Error::Rustls(e) if e.to_string().starts_with(CERT_REJECTED_PREFIX) => TransportError::Tls(e.to_string()),
+        other => TransportError::Other(other.to_string()),
+    }
+}
+
+/// Ask the server. Blocking: call it from a worker thread.
+pub fn probe(server: &Url, authorization: Option<&str>) -> ProbeOutcome {
+    probe_within(server, authorization, TIMEOUT)
+}
+
+/// `probe` with the time the whole exchange may take.
+fn probe_within(server: &Url, authorization: Option<&str>, timeout: Duration) -> ProbeOutcome {
+    let status_url = match server.join(STATUS_PATH) {
+        Ok(u) => u,
+        Err(e) => return ProbeOutcome::Failed { detail: e.to_string() },
+    };
+    let tls = ureq::tls::TlsConfig::builder()
+        .root_certs(ureq::tls::RootCerts::PlatformVerifier)
+        .build();
+    let agent: ureq::Agent = ureq::Agent::config_builder()
+        .timeout_global(Some(timeout))
+        .http_status_as_error(false)
+        // Never follow: a 3xx comes back as an answer and is explained.
+        .max_redirects(0)
+        .tls_config(tls)
+        .user_agent(concat!("CodemanDesktop/", env!("CARGO_PKG_VERSION")))
+        .build()
+        .into();
+    let mut req = agent.get(status_url.as_str()).header("Accept", "application/json");
+    if let Some(auth) = authorization {
+        req = req.header("Authorization", auth);
+    }
+    match req.call() {
+        Ok(mut resp) => {
+            let status = resp.status().as_u16();
+            let header = |name: &str| {
+                resp.headers()
+                    .get(name)
+                    .and_then(|v| v.to_str().ok())
+                    .map(str::to_string)
+            };
+            let location = header("location");
+            let retry_after = header("retry-after");
+            let body = match resp.body_mut().with_config().limit(MAX_BODY).read_to_string() {
+                Ok(body) => body,
+                // The answer began but did not finish in time. Where the body
+                // decides what answered (200, 403), that is a timeout, not
+                // "something else answers here".
+                Err(e) if matches!(status, 200 | 403) && transport_error(&e, false) == TransportError::Timeout => {
+                    return ProbeOutcome::Timeout;
+                }
+                Err(_) => String::new(),
+            };
+            classify_response(
+                &status_url,
+                status,
+                location.as_deref(),
+                retry_after.as_deref(),
+                authorization.is_some(),
+                &body,
+            )
+        }
+        Err(e) => classify_transport(transport_error(&e, status_url.scheme() == "http")),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::io;
+
+    fn status_url() -> Url {
+        Url::parse("http://studio.lan:3000/api/status").unwrap()
+    }
+
+    /// `classify_response` for the cases that need no headers.
+    fn classify(status: u16, sent_credentials: bool, body: &str) -> ProbeOutcome {
+        classify_response(&status_url(), status, None, None, sent_credentials, body)
+    }
+
+    fn redirect(request: &str, location: &str) -> ProbeOutcome {
+        classify_response(&Url::parse(request).unwrap(), 301, Some(location), None, false, "")
+    }
+
+    fn io_outcome(kind: io::ErrorKind, message: &str, plain_http: bool) -> ProbeOutcome {
+        let err = ureq::Error::Io(io::Error::new(kind, message.to_string()));
+        classify_transport(transport_error(&err, plain_http))
+    }
+
+    #[test]
+    fn ok_needs_success_and_version() {
+        assert_eq!(
+            classify(
+                200,
+                false,
+                r#"{"success":true,"data":{"version":"1.47.0","sessions":[]}}"#
+            ),
+            ProbeOutcome::Ok {
+                version: "1.47.0".into()
+            }
+        );
+        assert_eq!(
+            classify(200, false, "<html>hello</html>"),
+            ProbeOutcome::NotCodeman { status: 200 }
+        );
+        assert_eq!(
+            classify(200, false, r#"{"success":false,"data":{"version":"1"}}"#),
+            ProbeOutcome::NotCodeman { status: 200 }
+        );
+        assert_eq!(
+            classify(200, false, r#"{"success":true}"#),
+            ProbeOutcome::NotCodeman { status: 200 }
+        );
+    }
+
+    #[test]
+    fn auth_and_guards() {
+        assert_eq!(classify(401, false, "Unauthorized"), ProbeOutcome::NeedsLogin);
+        assert_eq!(classify(401, true, "Unauthorized"), ProbeOutcome::BadCredentials);
+        assert_eq!(
+            classify(403, false, "Forbidden: host not allowed"),
+            ProbeOutcome::HostNotAllowed
+        );
+        // The Host guard runs before authentication, so it wins even with credentials.
+        assert_eq!(
+            classify(403, true, "Forbidden: host not allowed"),
+            ProbeOutcome::HostNotAllowed
+        );
+        assert_eq!(classify(403, false, "nope"), ProbeOutcome::NotCodeman { status: 403 });
+        assert_eq!(classify(502, false, ""), ProbeOutcome::NotCodeman { status: 502 });
+    }
+
+    /// The exact body auth.ts sends: `createErrorResponse(PASSWORD_CHANGE_REQUIRED)`.
+    #[test]
+    fn password_change_required_only_after_sent_credentials() {
+        let body = r#"{"success":false,"error":"You must change your password before continuing","errorCode":"PASSWORD_CHANGE_REQUIRED"}"#;
+        assert_eq!(classify(403, true, body), ProbeOutcome::PasswordChangeRequired);
+        assert_eq!(classify(403, false, body), ProbeOutcome::NotCodeman { status: 403 });
+        // Another Codeman error code, or the text without the JSON field, is not it.
+        assert_eq!(
+            classify(403, true, r#"{"success":false,"errorCode":"FORBIDDEN"}"#),
+            ProbeOutcome::NotCodeman { status: 403 }
+        );
+        assert_eq!(
+            classify(403, true, "PASSWORD_CHANGE_REQUIRED"),
+            ProbeOutcome::NotCodeman { status: 403 }
+        );
+    }
+
+    #[test]
+    fn rate_limited_says_whether_credentials_went_along() {
+        let body = "Too Many Requests, try again later";
+        assert_eq!(
+            classify(429, false, body),
+            ProbeOutcome::RateLimited {
+                sent_credentials: false,
+                retry_after_secs: None
+            }
+        );
+        assert_eq!(
+            classify(429, true, body),
+            ProbeOutcome::RateLimited {
+                sent_credentials: true,
+                retry_after_secs: None
+            }
+        );
+        // auth.ts sends Retry-After in whole seconds; an HTTP date is not parsed.
+        assert_eq!(
+            classify_response(&status_url(), 429, None, Some(" 742 "), true, body),
+            ProbeOutcome::RateLimited {
+                sent_credentials: true,
+                retry_after_secs: Some(742)
+            }
+        );
+        assert_eq!(
+            classify_response(
+                &status_url(),
+                429,
+                None,
+                Some("Wed, 21 Oct 2026 07:28:00 GMT"),
+                false,
+                body
+            ),
+            ProbeOutcome::RateLimited {
+                sent_credentials: false,
+                retry_after_secs: None
+            }
+        );
+    }
+
+    #[test]
+    fn redirect_to_https_on_the_same_host_is_suggested() {
+        assert_eq!(
+            redirect("http://studio.lan/api/status", "https://studio.lan/api/status"),
+            ProbeOutcome::Redirect {
+                location: "https://studio.lan/api/status".into(),
+                suggested: Some("https://studio.lan/".into())
+            }
+        );
+        // A base path the proxy adds stays part of the suggestion; a query does not.
+        assert_eq!(
+            redirect(
+                "http://studio.lan:3000/api/status",
+                "https://studio.lan/codeman/api/status?from=http"
+            ),
+            ProbeOutcome::Redirect {
+                location: "https://studio.lan/codeman/api/status?from=http".into(),
+                suggested: Some("https://studio.lan/codeman/".into())
+            }
+        );
+        // A relative Location resolves against the probed URL; another port is fine.
+        assert_eq!(
+            redirect(
+                "http://studio.lan:3000/base/api/status",
+                "//studio.lan:3001/base/api/status"
+            ),
+            ProbeOutcome::Redirect {
+                location: "http://studio.lan:3001/base/api/status".into(),
+                suggested: Some("http://studio.lan:3001/base/".into())
+            }
+        );
+    }
+
+    #[test]
+    fn other_redirects_are_reported_without_a_suggestion() {
+        // Another host (a login gateway, say).
+        assert_eq!(
+            redirect("http://studio.lan/api/status", "https://sso.example.com/login?next=x"),
+            ProbeOutcome::Redirect {
+                location: "https://sso.example.com/login?next=x".into(),
+                suggested: None
+            }
+        );
+        // Same host, but no longer the status API.
+        assert_eq!(
+            redirect("http://studio.lan/api/status", "/login"),
+            ProbeOutcome::Redirect {
+                location: "http://studio.lan/login".into(),
+                suggested: None
+            }
+        );
+        // A downgrade to plain http.
+        assert_eq!(
+            redirect("https://studio.lan/api/status", "http://studio.lan/api/status"),
+            ProbeOutcome::Redirect {
+                location: "http://studio.lan/api/status".into(),
+                suggested: None
+            }
+        );
+        // Same scheme and port, only the path moved.
+        assert_eq!(
+            redirect("http://studio.lan/api/status", "/x/api/status"),
+            ProbeOutcome::Redirect {
+                location: "http://studio.lan/x/api/status".into(),
+                suggested: None
+            }
+        );
+        // Credentials in the target are never suggested.
+        assert_eq!(
+            redirect("http://studio.lan/api/status", "https://u:p@studio.lan/api/status"),
+            ProbeOutcome::Redirect {
+                location: "https://u:p@studio.lan/api/status".into(),
+                suggested: None
+            }
+        );
+        // No Location (304), or one that does not parse: nothing to act on.
+        assert_eq!(
+            classify_response(&status_url(), 304, None, None, false, ""),
+            ProbeOutcome::NotCodeman { status: 304 }
+        );
+        assert_eq!(
+            classify_response(&status_url(), 302, Some("http://[::1"), None, false, ""),
+            ProbeOutcome::NotCodeman { status: 302 }
+        );
+    }
+
+    #[test]
+    fn transport_classes() {
+        assert_eq!(classify_transport(TransportError::Refused), ProbeOutcome::Refused);
+        assert_eq!(classify_transport(TransportError::Timeout), ProbeOutcome::Timeout);
+        assert_eq!(classify_transport(TransportError::Dns), ProbeOutcome::Unresolvable);
+        assert_eq!(
+            classify_transport(TransportError::Tls("bad cert".into())),
+            ProbeOutcome::TlsUntrusted {
+                detail: "bad cert".into()
+            }
+        );
+    }
+
+    /// The io errors exactly as ureq hands them over (`Error::Io`).
+    #[test]
+    fn io_errors_are_told_apart() {
+        use io::ErrorKind;
+        // rustls' certificate rejection from the handshake.
+        let cert = "invalid peer certificate: UnknownIssuer";
+        assert_eq!(
+            io_outcome(ErrorKind::InvalidData, cert, false),
+            ProbeOutcome::TlsUntrusted { detail: cert.into() }
+        );
+        // Any other InvalidData (a port that does not speak TLS, say) is not a certificate problem.
+        assert_eq!(
+            io_outcome(
+                ErrorKind::InvalidData,
+                "received corrupt message of type InvalidContentType",
+                false
+            ),
+            ProbeOutcome::Failed {
+                detail: "received corrupt message of type InvalidContentType".into()
+            }
+        );
+        // std's getaddrinfo failure (its real kind, Uncategorized, cannot be built on stable).
+        assert_eq!(
+            io_outcome(
+                ErrorKind::Other,
+                "failed to lookup address information: nodename nor servname provided, or not known",
+                true
+            ),
+            ProbeOutcome::Unresolvable
+        );
+        // The same text from the OS (an errno) is not a lookup failure.
+        let os = ureq::Error::Io(io::Error::from_raw_os_error(1));
+        assert!(!matches!(
+            classify_transport(transport_error(&os, true)),
+            ProbeOutcome::Unresolvable
+        ));
+        // ureq's "Peer disconnected": over http a hint at https, over https just a failure.
+        assert_eq!(
+            io_outcome(ErrorKind::UnexpectedEof, "Peer disconnected", true),
+            ProbeOutcome::MaybeHttps
+        );
+        assert_eq!(
+            io_outcome(ErrorKind::UnexpectedEof, "Peer disconnected", false),
+            ProbeOutcome::Failed {
+                detail: "Peer disconnected".into()
+            }
+        );
+        // No route: Local Network privacy, or a machine that is off.
+        assert_eq!(
+            io_outcome(ErrorKind::HostUnreachable, "No route to host", true),
+            ProbeOutcome::Unreachable
+        );
+        assert_eq!(
+            io_outcome(ErrorKind::NetworkUnreachable, "Network is unreachable", false),
+            ProbeOutcome::Unreachable
+        );
+        assert_eq!(
+            io_outcome(ErrorKind::ConnectionRefused, "Connection refused", true),
+            ProbeOutcome::Refused
+        );
+        assert_eq!(
+            classify_transport(transport_error(&ureq::Error::HostNotFound, true)),
+            ProbeOutcome::Unresolvable
+        );
+        // A ureq TLS setup message is not an untrusted certificate.
+        assert_eq!(
+            classify_transport(transport_error(
+                &ureq::Error::Tls("Rustls invalid dns name error"),
+                false
+            )),
+            ProbeOutcome::Failed {
+                detail: "Rustls invalid dns name error".into()
+            }
+        );
+    }
+
+    #[test]
+    fn outcome_serializes_for_the_page() {
+        let json = |o: ProbeOutcome| serde_json::to_value(o).unwrap();
+        assert_eq!(
+            json(ProbeOutcome::NotCodeman { status: 404 }),
+            serde_json::json!({"kind":"notCodeman","status":404})
+        );
+        assert_eq!(json(ProbeOutcome::NeedsLogin), serde_json::json!({"kind":"needsLogin"}));
+        assert_eq!(
+            json(ProbeOutcome::RateLimited {
+                sent_credentials: true,
+                retry_after_secs: None
+            }),
+            serde_json::json!({"kind":"rateLimited","sentCredentials":true})
+        );
+        assert_eq!(
+            json(ProbeOutcome::RateLimited {
+                sent_credentials: false,
+                retry_after_secs: Some(60)
+            }),
+            serde_json::json!({"kind":"rateLimited","sentCredentials":false,"retryAfterSecs":60})
+        );
+        assert_eq!(
+            json(ProbeOutcome::PasswordChangeRequired),
+            serde_json::json!({"kind":"passwordChangeRequired"})
+        );
+        assert_eq!(
+            json(ProbeOutcome::Redirect {
+                location: "https://studio.lan/api/status".into(),
+                suggested: Some("https://studio.lan/".into())
+            }),
+            serde_json::json!({"kind":"redirect","location":"https://studio.lan/api/status","suggested":"https://studio.lan/"})
+        );
+        assert_eq!(
+            json(ProbeOutcome::Redirect {
+                location: "https://sso.example.com/".into(),
+                suggested: None
+            }),
+            serde_json::json!({"kind":"redirect","location":"https://sso.example.com/","suggested":null})
+        );
+        assert_eq!(
+            json(ProbeOutcome::Unreachable),
+            serde_json::json!({"kind":"unreachable"})
+        );
+        assert_eq!(json(ProbeOutcome::MaybeHttps), serde_json::json!({"kind":"maybeHttps"}));
+        assert_eq!(
+            json(ProbeOutcome::TlsUntrusted { detail: "x".into() }),
+            serde_json::json!({"kind":"tlsUntrusted","detail":"x"})
+        );
+        assert_eq!(
+            json(ProbeOutcome::Unresolvable),
+            serde_json::json!({"kind":"unresolvable"})
+        );
+    }
+
+    /// Against real sockets: a closed port is `Refused`, a listener that
+    /// speaks HTTP but not Codeman is `NotCodeman`, a fake Codeman is `Ok`,
+    /// a 401 is `NeedsLogin`, a redirect is reported without being followed,
+    /// and a listener that hangs up without answering is `MaybeHttps`.
+    #[test]
+    fn probe_against_local_sockets() {
+        use std::io::{Read, Write};
+        use std::net::TcpListener;
+
+        let closed = {
+            let l = TcpListener::bind("127.0.0.1:0").unwrap();
+            l.local_addr().unwrap().port()
+        };
+        let url = Url::parse(&format!("http://127.0.0.1:{closed}/")).unwrap();
+        assert_eq!(probe(&url, None), ProbeOutcome::Refused);
+
+        /// Accept one connection, read the request and send `response`
+        /// (nothing, then close, for an empty one).
+        fn serve_raw(response: String) -> u16 {
+            let l = TcpListener::bind("127.0.0.1:0").unwrap();
+            let port = l.local_addr().unwrap().port();
+            std::thread::spawn(move || {
+                if let Ok((mut s, _)) = l.accept() {
+                    // Read the whole request head (a GET has no body) so that
+                    // closing sends a FIN, not a reset for unread bytes.
+                    let mut head = Vec::new();
+                    let mut buf = [0u8; 4096];
+                    while !head.windows(4).any(|w| w == b"\r\n\r\n") {
+                        match s.read(&mut buf) {
+                            Ok(0) | Err(_) => break,
+                            Ok(n) => head.extend_from_slice(&buf[..n]),
+                        }
+                    }
+                    let _ = s.write_all(response.as_bytes());
+                }
+            });
+            port
+        }
+        fn serve_once(status_line: &str, extra_headers: &str, body: &str) -> u16 {
+            serve_raw(format!(
+                "HTTP/1.1 {status_line}\r\nContent-Type: application/json\r\nContent-Length: {}\r\n{extra_headers}Connection: close\r\n\r\n{body}",
+                body.len()
+            ))
+        }
+
+        let p = serve_once("200 OK", "", r#"{"success":true,"data":{"version":"9.9.9"}}"#);
+        let url = Url::parse(&format!("http://127.0.0.1:{p}/")).unwrap();
+        assert_eq!(
+            probe(&url, None),
+            ProbeOutcome::Ok {
+                version: "9.9.9".into()
+            }
+        );
+
+        let p = serve_once("404 Not Found", "", "nope");
+        let url = Url::parse(&format!("http://127.0.0.1:{p}/")).unwrap();
+        assert_eq!(probe(&url, None), ProbeOutcome::NotCodeman { status: 404 });
+
+        let p = serve_once("401 Unauthorized", "", "Unauthorized");
+        let url = Url::parse(&format!("http://127.0.0.1:{p}/")).unwrap();
+        assert_eq!(probe(&url, None), ProbeOutcome::NeedsLogin);
+
+        let p = serve_once("429 Too Many Requests", "Retry-After: 30\r\n", "Too Many Requests");
+        let url = Url::parse(&format!("http://127.0.0.1:{p}/")).unwrap();
+        assert_eq!(
+            probe(&url, Some("Basic YWRtaW46eA==")),
+            ProbeOutcome::RateLimited {
+                sent_credentials: true,
+                retry_after_secs: Some(30)
+            }
+        );
+
+        // Nothing listens on the redirect target: had it been followed, the
+        // answer would be Refused instead.
+        let p = serve_once(
+            "301 Moved Permanently",
+            &format!("Location: https://127.0.0.1:{closed}/api/status\r\n"),
+            "",
+        );
+        let url = Url::parse(&format!("http://127.0.0.1:{p}/")).unwrap();
+        assert_eq!(
+            probe(&url, None),
+            ProbeOutcome::Redirect {
+                location: format!("https://127.0.0.1:{closed}/api/status"),
+                suggested: Some(format!("https://127.0.0.1:{closed}/"))
+            }
+        );
+
+        let p = serve_raw(String::new());
+        let url = Url::parse(&format!("http://127.0.0.1:{p}/")).unwrap();
+        assert_eq!(probe(&url, None), ProbeOutcome::MaybeHttps);
+    }
+
+    /// A Codeman that sends its status headers and then stalls (a blocked
+    /// event loop, a lossy link) did not answer in time. It is not "something
+    /// else on this port", which is what an empty body read as before.
+    #[test]
+    fn a_body_that_stalls_is_a_timeout() {
+        use std::io::{Read, Write};
+        use std::net::TcpListener;
+
+        /// Send `head` and the start of a body, then hold the connection open.
+        fn serve_stalling(status_line: &'static str) -> u16 {
+            let l = TcpListener::bind("127.0.0.1:0").unwrap();
+            let port = l.local_addr().unwrap().port();
+            std::thread::spawn(move || {
+                if let Ok((mut s, _)) = l.accept() {
+                    let mut buf = [0u8; 4096];
+                    let _ = s.read(&mut buf);
+                    let _ = s.write_all(
+                        format!("HTTP/1.1 {status_line}\r\nContent-Type: application/json\r\nContent-Length: 4096\r\n\r\n{{\"success\":true,").as_bytes(),
+                    );
+                    std::thread::sleep(Duration::from_secs(3));
+                }
+            });
+            port
+        }
+        let short = Duration::from_millis(400);
+
+        let url = Url::parse(&format!("http://127.0.0.1:{}/", serve_stalling("200 OK"))).unwrap();
+        assert_eq!(probe_within(&url, None, short), ProbeOutcome::Timeout);
+
+        // A 401 has said all it needs to with its status line.
+        let url = Url::parse(&format!("http://127.0.0.1:{}/", serve_stalling("401 Unauthorized"))).unwrap();
+        assert_eq!(probe_within(&url, None, short), ProbeOutcome::NeedsLogin);
+    }
+}

src/live-worktree.ts

@@ -1,94 +0,0 @@
-/**
- * @fileoverview Which linked git worktree a session's pane is in.
- *
- * Claude Code's worktree feature moves the running `claude` process into
- * `<repo>/.claude/worktrees/<name>` part way through a session. `Session.workingDir` is the
- * session's identity and stays on the main checkout, so the Files panel kept listing a tree the
- * agent had left (#765). `Session.paneCwd` does follow: tmux reads the process cwd, measured with
- * Claude Code 2.1.318 going into a worktree on EnterWorktree and back on ExitWorktree. It also
- * follows every `cd` in a shell session, so it cannot be the panel's root by itself. This module
- * answers the narrower question: is the pane inside a linked worktree, and which one.
- *
- * A linked worktree is recognised by its `.git` FILE (`gitdir: <repo>/.git/worktrees/<id>`) rather
- * than by running `git worktree list`: this runs from the pane watcher whenever a directory
- * changes, and a file read starts no process, no repository config and no filter.
- *
- * Only a folder at or below `workingDir` is ever an answer, and that is the whole security
- * argument: the file routes already serve everything under `workingDir`, so following a pane
- * there widens nothing, and a planted `.git` file can only move where the listing STARTS inside
- * that same folder. A worktree outside it (`git worktree add ../feature`) stays unfollowed, since
- * listing it would need a second confinement root. Nothing here is a confinement decision: the
- * routes keep judging every path against `workingDir`.
- *
- * Probes are bounded (#516). The folder can sit on a mount that stopped answering, and an
- * `unknown` answer stops the walk rather than being read as "no `.git` here".
- *
- * @module live-worktree
- */
-
-import { promises as fs } from 'node:fs';
-import { basename, dirname, join } from 'node:path';
-import { probePathKind } from './utils/bounded-path-probe.js';
-
-/** A linked worktree a session's pane is in. */
-export interface LiveWorktree {
-  /** The worktree folder's name, for display. */
-  name: string;
-  /** Absolute path, spelled like the session's `workingDir`. */
-  path: string;
-}
-
-/** More than any real `.git` file. It is read only to recognise the first line. */
-const MAX_DOT_GIT_FILE_BYTES = 4096;
-
-/**
- * Whether the text of a `.git` file names a linked worktree's git dir
- * (`<common dir>/worktrees/<id>`), as opposed to a submodule's (`<common dir>/modules/<name>`).
- * The path may be relative: `git worktree add --relative-paths` writes it that way.
- */
-export function isLinkedWorktreeGitFile(text: string): boolean {
-  const gitDir = /^gitdir:[ \t]*(.+?)[ \t]*$/m.exec(text)?.[1];
-  if (!gitDir) return false;
-  const segments = gitDir.split('/').filter(Boolean);
-  return segments.length >= 2 && segments[segments.length - 2] === 'worktrees';
-}
-
-/** What `<dir>/.git` says: a linked worktree's root, a boundary the walk must stop at, or nothing. */
-async function classifyDotGit(dir: string): Promise<'worktree' | 'stop' | 'none'> {
-  const dotGit = join(dir, '.git');
-  const kind = await probePathKind(dotGit);
-  if (kind === 'absent') return 'none';
-  // A `.git` directory is a repository of its own, and `unknown` is never read as absent.
-  if (kind !== 'file') return 'stop';
-  let handle: fs.FileHandle | undefined;
-  try {
-    // lstat, so a `.git` that is a symlink or a FIFO is refused before anything opens it:
-    // opening a FIFO waits for a writer and would hold a threadpool worker for good.
-    if (!(await fs.lstat(dotGit)).isFile()) return 'stop';
-    handle = await fs.open(dotGit, 'r');
-    const { buffer, bytesRead } = await handle.read(Buffer.alloc(MAX_DOT_GIT_FILE_BYTES), 0, MAX_DOT_GIT_FILE_BYTES, 0);
-    return isLinkedWorktreeGitFile(buffer.toString('utf8', 0, bytesRead)) ? 'worktree' : 'stop';
-  } catch {
-    return 'stop';
-  } finally {
-    await handle?.close().catch(() => {});
-  }
-}
-
-/**
- * The linked worktree strictly below `workingDir` that holds `cwd`, if any. Walks up from `cwd`
- * and stops at `workingDir`, at a repository or submodule of its own, or at anything it cannot
- * read. `workingDir` itself is never an answer: a session started in a worktree is already
- * listing it. Never throws.
- */
-export async function findLiveWorktree(workingDir: string, cwd: string | undefined): Promise<LiveWorktree | undefined> {
-  if (!cwd?.startsWith('/')) return undefined;
-  const root = workingDir.length > 1 ? workingDir.replace(/\/+$/, '') : workingDir;
-  const under = root === '/' ? '/' : `${root}/`;
-  for (let dir = cwd; dir !== root && dir.startsWith(under); dir = dirname(dir)) {
-    const found = await classifyDotGit(dir);
-    if (found === 'worktree') return { name: basename(dir), path: dir };
-    if (found === 'stop') return undefined;
-  }
-  return undefined;
-}

src/session.ts

@@ -73,7 +73,6 @@ import type { GitFetchStatus } from './git-fetch.js';
 import { resolveAndClaimOmpSessionId } from './utils/omp-session-resolver.js';
 import { claudeTranscriptExists } from './utils/claude-transcript.js';
 import { probePathKind } from './utils/bounded-path-probe.js';
-import type { LiveWorktree } from './live-worktree.js';
 import { PATH_PROBE_TIMEOUT_MS, WORKSPACE_REALPATH_RETRY_MS } from './config/path-probe.js';
 import { matchesPattern } from './config/cli-registry/patterns.js';
 import { probeDockerCliVersion } from './docker-hosts.js';
@@ -767,8 +766,6 @@ export class Session extends EventEmitter {
    * serialized by toState() but never restored by the constructor.
    */
   private _paneCwd: string | undefined;
-  /** See {@link liveWorktree}. */
-  private _liveWorktree: LiveWorktree | undefined;
   /**
    * `workingDir` with symlinks resolved, so a pane reading (tmux reads the
    * process cwd, always the resolved path) can be put back into `workingDir`'s
@@ -1579,22 +1576,6 @@ export class Session extends EventEmitter {
     return true;
   }
 
-  /**
-   * The linked git worktree inside `workingDir` that {@link paneCwd} is in, when there is one
-   * (`live-worktree.ts`). The Files panel lists it instead of the main checkout. Runtime-only and
-   * never a confinement root, like `paneCwd`: it is always a folder the file routes already serve.
-   */
-  get liveWorktree(): LiveWorktree | undefined {
-    return this._liveWorktree;
-  }
-
-  /** Record the result of a worktree lookup. Returns whether it CHANGED, so the caller broadcasts only then. */
-  setLiveWorktree(next: LiveWorktree | undefined): boolean {
-    if (next?.path === this._liveWorktree?.path) return false;
-    this._liveWorktree = next;
-    return true;
-  }
-
   /** `workingDir` without a trailing separator (the root stays `/`). */
   private _workspaceSpelling(): string {
     return this.workingDir.length > 1 ? this.workingDir.replace(/\/+$/, '') : this.workingDir;
@@ -2319,7 +2300,6 @@ export class Session extends EventEmitter {
       status: this._status,
       workingDir: this.workingDir,
       paneCwd: this._paneCwd,
-      liveWorktree: this._liveWorktree,
       remote: this._remote,
       docker: this._docker,
       owner: this._owner,

src/types/session.ts

@@ -34,7 +34,6 @@
 import type { RespawnConfig } from './respawn.js';
 import type { AttachmentDetectedType } from './tools.js';
 import type { GitFetchStatus } from '../git-fetch.js';
-import type { LiveWorktree } from '../live-worktree.js';
 
 /** Status of a Claude session */
 export type SessionStatus = 'idle' | 'busy' | 'stopped' | 'error';
@@ -848,15 +847,6 @@ export interface SessionState {
    * routes like any other out-of-workspace path.
    */
   paneCwd?: string;
-  /**
-   * The linked git worktree inside `workingDir` that the pane is in NOW, when there is one:
-   * Claude Code's `.claude/worktrees/<name>`, or any other worktree of the repository under
-   * the session's folder. Derived from {@link paneCwd} by `live-worktree.ts`, so it is
-   * runtime-only and absent wherever `paneCwd` is, and absent for a worktree outside
-   * `workingDir`: the file routes never serve those. NOT a confinement root; the Files panel
-   * only starts its listing here.
-   */
-  liveWorktree?: LiveWorktree;
   /** Remote execution metadata, present when this session runs over SSH through local tmux */
   remote?: SessionRemote;
   /** Docker execution metadata, present when this session runs inside a container via local tmux + docker exec */

src/web/public/app.js

@@ -2458,8 +2458,6 @@ class CodemanApp {
     }
     // cliMouseTracking (Claude's fullscreen mode) ends a keyboard row hold.
     if (session.id === this.activeSessionId) this._reconcileKeyboardHold?.();
-    // The agent moved into or out of a git worktree while the Files panel is open (#765).
-    if (session.id === this.activeSessionId) this._followFileBrowserWorktree?.(session);
     // Update parentSessionName for any subagents belonging to this session
     // (fixes stale name display after session rename)
     this.updateSubagentParentNames(session.id);

src/web/public/i18n.js

@@ -983,6 +983,14 @@
     'Could not open a new window for this session': '无法在新窗口中打开此会话',
     'Could not open a new window for this preview': '无法在新窗口中打开此预览',
     'Could not open a new window for this dashboard': '无法在新窗口中打开此网页标签',
+    // The Codeman desktop app's shim when the app would not open the window a
+    // page asked for (packages/desktop/src/assets.rs).
+    'Could not open a new window': '无法打开新窗口',
+    // A subagent transcript or a detached preview whose window.open came back
+    // null (panels-ui.js viewSubagentTranscript / detachFilePreview).
+    'Could not open the transcript window: pop-up windows are blocked here': '无法打开对话记录窗口：此处已阻止弹出窗口',
+    'Pop-up blocked: allow pop-ups for this site to detach previews':
+      '弹出窗口已被阻止：请允许此网站的弹出窗口以分离预览',
     // Dictation whose session closed before the text was sent (voice-input.js).
     'That session has closed; dictation not sent': '该会话已关闭，语音输入未发送',
     // Terminal touch-selection bar (long-press to select). The bar is a sibling of
@@ -1133,9 +1141,6 @@
     'Filter by date range': '按日期范围筛选',
     'Filter by session status': '按会话状态筛选',
     'Filter files...': '筛选文件…',
-    Worktree: '工作树',
-    'Session folder': '会话文件夹',
-    'Back to worktree': '返回工作树',
     'Any status': '任意状态',
     'Any time': '任意时间',
     'Last hour': '最近一小时',
@@ -1460,6 +1465,10 @@
       [/^Worktree (\S+) was kept: ([\s\S]+)$/, (_m, wt, why) => `工作树 ${wt} 已保留：${why}`],
       // A pick, drop or paste that mixed admitted files with refused ones (image-input.js).
       [/^(\d+) files? skipped: unsupported type$/, (_m, n) => `已跳过 ${n} 个不支持类型的文件`],
+      // The Codeman desktop app's download toasts (packages/desktop/src/assets.rs).
+      // The file name is user text: it passes through untranslated.
+      [/^Downloaded (.+) to Downloads$/, (_m, name) => `已将 ${name} 下载到“下载”文件夹`],
+      [/^Download of (.+) failed$/, (_m, name) => `下载 ${name} 失败`],
       // Group names are user text: they pass through untranslated.
       [/^Move to "(.+)"$/, (_m, group) => `移到“${group}”`],
       // Session names are user text too.

src/web/public/index.html

@@ -617,11 +617,6 @@
           <button class="btn-icon-sm" onclick="app.closeFileBrowserPanel()" title="Close">&times;</button>
         </div>
       </div>
-      <div class="file-browser-root" id="fileBrowserRoot" hidden>
-        <span class="file-browser-root-label" id="fileBrowserRootLabel"></span>
-        <span class="file-browser-root-name" id="fileBrowserRootName" data-i18n-skip></span>
-        <button type="button" class="file-browser-root-switch" id="fileBrowserRootSwitch" onclick="app.toggleFileBrowserRoot()"></button>
-      </div>
       <div class="file-browser-search">
         <input type="text" id="fileBrowserSearch" placeholder="Filter files..." oninput="app.filterFileBrowser(this.value)">
       </div>

src/web/public/panels-ui.js

@@ -1963,7 +1963,16 @@ Object.assign(CodemanApp.prototype, {
 
       // Show in a modal or new window
       const content = data.data.formatted.join('\n');
-      const win = window.open('', '_blank', 'width=800,height=600');
+      // This open runs after the fetch above, so a pop-up blocker that wants a
+      // click can refuse it, and the Codeman desktop app always refuses an
+      // empty window. Both return null; say so instead of throwing into the
+      // catch below, whose 'Failed to load transcript' would be wrong.
+      let win = null;
+      try { win = window.open('', '_blank', 'width=800,height=600'); } catch {}
+      if (!win) {
+        this.showToast('Could not open the transcript window: pop-up windows are blocked here', 'error');
+        return;
+      }
       win.document.write(`
         <html>
           <head>
@@ -3282,8 +3291,6 @@ Object.assign(CodemanApp.prototype, {
         matches: [],
         deferredDirectoryTarget: null,
         filter: typeof this.fileBrowserFilter === 'string' ? this.fileBrowserFilter : '',
-        // The person asked for the session folder while the agent is in a worktree (#765).
-        sessionRootPinned: false,
       };
     }
     return this._fileBrowserState;
@@ -3306,7 +3313,6 @@ Object.assign(CodemanApp.prototype, {
     state.deferredDirectoryTarget = null;
     state.filter = '';
     state.view = 'normal';
-    state.sessionRootPinned = false;
     this.fileBrowserData = null;
     this.fileBrowserFilter = '';
     this.fileBrowserExpandedDirs?.clear?.();
@@ -3317,7 +3323,6 @@ Object.assign(CodemanApp.prototype, {
     this._syncFileBrowserExpandBtn();
     const expandBtn = this.$?.('fileBrowserExpandBtn');
     if (expandBtn) expandBtn.innerHTML = '\u229E';
-    this._renderFileBrowserRoot(null);
 
     const panel = this.$?.('fileBrowserPanel');
     const treeEl = this.$?.('fileBrowserTree');
@@ -3350,7 +3355,6 @@ Object.assign(CodemanApp.prototype, {
     state.deferredDirectoryTarget = null;
     state.filter = '';
     state.view = 'normal';
-    state.sessionRootPinned = false;
     this.fileBrowserData = null;
     this.fileBrowserFilter = '';
     this.fileBrowserExpandedDirs?.clear?.();
@@ -3361,7 +3365,6 @@ Object.assign(CodemanApp.prototype, {
     this._syncFileBrowserExpandBtn();
     const expandBtn = this.$?.('fileBrowserExpandBtn');
     if (expandBtn) expandBtn.innerHTML = '\u229E';
-    this._renderFileBrowserRoot(null);
     const treeEl = this.$?.('fileBrowserTree');
     if (treeEl) treeEl.innerHTML = '';
     const statusEl = this.$?.('fileBrowserStatus');
@@ -3454,60 +3457,6 @@ Object.assign(CodemanApp.prototype, {
     this._syncFileBrowserExpandBtn();
     this.renderFileBrowserTree(normalState.sessionId);
     this._renderFileBrowserNormalStatus(normalState.data, normalState.showHidden);
-    this._renderFileBrowserRoot(normalState.data);
-  },
-
-  // The strip under the panel header, present only while the session's pane is in a linked
-  // worktree (#765): it says which of the two folders is listed and switches between them.
-  // Everything here comes from GET .../files, so the strip describes the tree on screen rather
-  // than the session's state a moment later.
-  _renderFileBrowserRoot(data) {
-    const strip = this.$?.('fileBrowserRoot');
-    if (!strip) return;
-    const worktree = data?.worktree;
-    if (typeof worktree?.path !== 'string' || typeof worktree?.name !== 'string') {
-      strip.hidden = true;
-      return;
-    }
-    const inWorktree = data.root === worktree.path;
-    const label = this.$?.('fileBrowserRootLabel');
-    const name = this.$?.('fileBrowserRootName');
-    const button = this.$?.('fileBrowserRootSwitch');
-    if (label) label.textContent = inWorktree ? 'Worktree' : 'Session folder';
-    if (name) name.textContent = inWorktree ? worktree.name : '';
-    if (button) button.textContent = inWorktree ? 'Session folder' : 'Back to worktree';
-    strip.title = typeof data.root === 'string' ? data.root : '';
-    strip.hidden = false;
-  },
-
-  // The `root` parameter of a listing or search. The server ignores it while the pane is not in
-  // a worktree, so the panel always asks unless the person chose the session folder.
-  _fileBrowserRootParam() {
-    return this._ensureFileBrowserState().sessionRootPinned ? '' : '&root=live';
-  },
-
-  toggleFileBrowserRoot() {
-    const state = this._ensureFileBrowserState();
-    state.sessionRootPinned = !state.sessionRootPinned;
-    return this._reloadFileBrowserKeepingQuery();
-  },
-
-  // Called on every session update of the active session. Compares with what the listing on
-  // screen reported rather than with the previous update, so a load already in flight when the
-  // pane moved is corrected by the next update, and an answer that matches ends it: a listing
-  // always reports the session's worktree, whichever folder it walked, so this cannot loop.
-  _followFileBrowserWorktree(session) {
-    const state = this._fileBrowserState;
-    if (!state || state.ownerSessionId !== session.id) return;
-    if (this.$?.('fileBrowserPanel')?.classList.contains('visible') !== true) return;
-    const normal = state.normalState;
-    if (normal?.phase !== 'ready' || normal.sessionId !== session.id) return;
-    const live = session.liveWorktree?.path ?? null;
-    const listed = normal.data?.worktree?.path ?? null;
-    if (live === listed) return;
-    // The pin was about the worktree the agent has just left.
-    state.sessionRootPinned = false;
-    this._reloadFileBrowserKeepingQuery();
   },
 
   _validateFileBrowserTreeEnvelope(result) {
@@ -3612,20 +3561,14 @@ Object.assign(CodemanApp.prototype, {
   },
 
   async toggleFileBrowserHidden() {
+    const state = this._ensureFileBrowserState();
+    const rawInput = typeof state.filter === 'string' ? state.filter : '';
+    const query = rawInput.trim();
     this.fileBrowserShowHidden = !this.fileBrowserShowHidden;
     try {
       localStorage.setItem(FILE_BROWSER_SHOW_HIDDEN_KEY, this.fileBrowserShowHidden ? '1' : '0');
     } catch {}
     this._syncFileBrowserHiddenBtn();
-    return this._reloadFileBrowserKeepingQuery();
-  },
-
-  // Re-fetch the tree after something the server filters on changed (hidden files, the listing's
-  // root), then re-run the search in the box against the new tree.
-  async _reloadFileBrowserKeepingQuery() {
-    const state = this._ensureFileBrowserState();
-    const rawInput = typeof state.filter === 'string' ? state.filter : '';
-    const query = rawInput.trim();
 
     if (state.inFlight?.timer !== undefined && state.inFlight?.timer !== null) {
       clearTimeout(state.inFlight.timer);
@@ -3699,7 +3642,7 @@ Object.assign(CodemanApp.prototype, {
     const request = (async () => {
       try {
         const res = await fetch(
-          `/api/sessions/${encodeURIComponent(sessionId)}/files?depth=5&showHidden=${showHidden}${this._fileBrowserRootParam()}`,
+          `/api/sessions/${encodeURIComponent(sessionId)}/files?depth=5&showHidden=${showHidden}`,
         );
         if (!res.ok) throw new Error('Failed to load files');
         const result = await res.json();
@@ -3886,7 +3829,6 @@ Object.assign(CodemanApp.prototype, {
       showHidden: this.fileBrowserShowHidden === true,
       rawInput,
       query,
-      rootParam: this._fileBrowserRootParam(),
       timer: null,
     };
     state.view = 'search-pending';
@@ -3901,7 +3843,7 @@ Object.assign(CodemanApp.prototype, {
       request.timer = null;
       try {
         const res = await fetch(
-          `/api/sessions/${encodeURIComponent(ownerSessionId)}/files?depth=5&showHidden=${request.showHidden}&q=${encodeURIComponent(query)}${request.rootParam}`,
+          `/api/sessions/${encodeURIComponent(ownerSessionId)}/files?depth=5&showHidden=${request.showHidden}&q=${encodeURIComponent(query)}`,
         );
         if (!res.ok) throw new Error('Search failed');
         const result = await res.json();

src/web/public/styles.css

@@ -12207,45 +12207,6 @@ html:is([data-skin="paper-gray"], [data-skin="solarized-light"], [data-skin="cat
   background: var(--bg-hover);
 }
 
-.file-browser-root {
-  display: flex;
-  align-items: center;
-  gap: 0.4rem;
-  padding: 0.25rem 0.5rem;
-  border-bottom: 1px solid var(--border);
-  font-size: 0.7rem;
-  color: var(--text-dim);
-}
-
-.file-browser-root[hidden] {
-  display: none;
-}
-
-.file-browser-root-name {
-  flex: 1 1 auto;
-  min-width: 0;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-  color: var(--text);
-}
-
-.file-browser-root-switch {
-  flex: 0 0 auto;
-  padding: 0.1rem 0.4rem;
-  border: 1px solid var(--border);
-  border-radius: 4px;
-  background: transparent;
-  color: inherit;
-  font: inherit;
-  cursor: pointer;
-}
-
-.file-browser-root-switch:hover {
-  color: var(--text);
-  border-color: var(--text-dim);
-}
-
 .file-browser-search {
   padding: 0.4rem;
   border-bottom: 1px solid var(--border);

src/web/routes/file-routes.ts

@@ -1595,27 +1595,12 @@ export function registerFileRoutes(app: FastifyInstance, ctx: SessionPort & Even
   // File tree listing
   app.get('/api/sessions/:id/files', async (req) => {
     const { id } = req.params as { id: string };
-    const { depth, showHidden, q, root } = req.query as {
-      depth?: string;
-      showHidden?: string;
-      q?: string;
-      root?: string;
-    };
+    const { depth, showHidden, q } = req.query as { depth?: string; showHidden?: string; q?: string };
     const session = findSessionOrFail(ctx, id, req);
 
     const maxDepth = Math.min(parseInt(depth || '5', 10), 10);
     const includeHidden = showHidden === 'true';
     const workingDir = session.workingDir;
-    // `root=live` starts the walk at the linked worktree the pane is in (#765). That folder is
-    // inside `workingDir` (`live-worktree.ts`), and every `path` below stays relative to
-    // `workingDir`, so file-content, file-raw and the edit route need nothing new and judge these
-    // paths against the same root as any other. Only the search predicate reads a path relative
-    // to the listing, since that is the tree the person is looking at.
-    const liveWorktree = session.liveWorktree;
-    const walkRoot =
-      root === 'live' && liveWorktree && (await probePathKind(liveWorktree.path, { pastCap: true })) === 'directory'
-        ? liveWorktree.path
-        : workingDir;
     // null for an empty/whitespace query, which is what keeps the default
     // tree response byte-identical when no search is requested.
     const matcher = compileFileQuery(q ?? '');
@@ -1691,18 +1676,17 @@ export function registerFileRoutes(app: FastifyInstance, ctx: SessionPort & Even
 
           const fullPath = join(dirPath, entry.name);
           const relativePath = relative(workingDir, fullPath);
-          const listedPath = relative(walkRoot, fullPath);
 
           if (entry.isDirectory()) {
             totalDirectories++;
-            if (matcher(entry.name, listedPath)) {
+            if (matcher(entry.name, relativePath)) {
               matches.push({ name: entry.name, path: relativePath, type: 'directory' });
             }
             // Always recurse, even when this directory does not match.
             await searchDirectory(fullPath, currentDepth + 1);
           } else {
             totalFiles++;
-            if (matcher(entry.name, listedPath)) {
+            if (matcher(entry.name, relativePath)) {
               let size: number | undefined;
               try {
                 size = (await fs.stat(fullPath)).size;
@@ -1721,13 +1705,12 @@ export function registerFileRoutes(app: FastifyInstance, ctx: SessionPort & Even
         }
       };
 
-      await searchDirectory(walkRoot, 1);
+      await searchDirectory(workingDir, 1);
 
       return {
         success: true,
         data: {
-          root: walkRoot,
-          ...(liveWorktree && { worktree: liveWorktree }),
+          root: workingDir,
           tree: [],
           matches,
           totalFiles,
@@ -1808,13 +1791,12 @@ export function registerFileRoutes(app: FastifyInstance, ctx: SessionPort & Even
       }
     };
 
-    const tree = await scanDirectory(walkRoot, 1);
+    const tree = await scanDirectory(workingDir, 1);
 
     return {
       success: true,
       data: {
-        root: walkRoot,
-        ...(liveWorktree && { worktree: liveWorktree }),
+        root: workingDir,
         tree,
         totalFiles,
         totalDirectories,

src/web/server.ts

@@ -35,7 +35,6 @@ import fastifyWebsocket from '@fastify/websocket';
 import fastifyMultipart from '@fastify/multipart';
 import { pasteImageDirInUseByOtherSession, startPasteImageGc, uploadDirs } from './paste-image-gc.js';
 import { CLEAN_EXIT_CLOSE_REASON, shouldCloseCleanlyExitedSession } from '../pane-exit-sweep.js';
-import { findLiveWorktree } from '../live-worktree.js';
 import { join, dirname } from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { existsSync, mkdirSync, readFileSync, chmodSync, statSync } from 'node:fs';
@@ -2968,7 +2967,6 @@ export class WebServer extends EventEmitter {
       // `undefined` here means an authoritative read listed no single directory
       // for the session (split into several panes, or gone from the socket).
       const paneCwdChanged = getPaneCurrentPath ? session.setPaneCwd(getPaneCurrentPath(muxName)) : false;
-      if (paneCwdChanged) void this.refreshLiveWorktree(session);
       if (session.setPaneExit(getPaneExit(muxName))) {
         this.persistSessionState(session);
       } else if (!paneCwdChanged) {
@@ -2979,18 +2977,6 @@ export class WebServer extends EventEmitter {
     this.closeCleanlyExitedSessions();
   }
 
-  /**
-   * Work out which linked worktree a session's pane moved into (#765). In the background, since
-   * it reads the folder, and only after the directory changed, so an idle pane costs nothing.
-   * A reading newer than the one this lookup started from owns the answer.
-   */
-  private async refreshLiveWorktree(session: Session): Promise<void> {
-    const cwd = session.paneCwd;
-    const worktree = await findLiveWorktree(session.workingDir, cwd);
-    if (session.paneCwd !== cwd) return;
-    if (session.setLiveWorktree(worktree)) this.broadcastSessionStateDebounced(session.id);
-  }
-
   /**
    * Close every session whose agent exited cleanly, through the same
    * `cleanupSession()` the X button uses (Ark0N/Codeman#446). A pinned session

test/desktop-toast-i18n.test.ts

@@ -0,0 +1,91 @@
+/**
+ * @fileoverview zh-CN coverage for the toasts shown when a window could not be
+ * opened, and for the Codeman desktop app's own toasts.
+ *
+ * The literals are read from their sources: the transcript and detached
+ * preview toasts from panels-ui.js, and the desktop shim's toasts from
+ * packages/desktop/src/assets.rs (a Rust file whose strings reach Codeman's
+ * `showToast`), so a reworded toast on either side without an entry fails
+ * here. The download toasts carry a file name and go through the pattern
+ * rule, which must keep the name exactly as written.
+ *
+ * Port: N/A.
+ */
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import vm from 'node:vm';
+import { JSDOM } from 'jsdom';
+import { afterAll, describe, expect, it } from 'vitest';
+
+const PUBLIC = resolve(import.meta.dirname, '../src/web/public');
+const read = (f: string) => readFileSync(resolve(PUBLIC, f), 'utf8');
+const I18N = read('i18n.js');
+const PANELS_UI = read('panels-ui.js');
+const ASSETS_RS = readFileSync(resolve(import.meta.dirname, '../packages/desktop/src/assets.rs'), 'utf8');
+
+type Api = { t(s: string): string; configure(o: Record<string, string>): void };
+function translator(language: string) {
+  const dom = new JSDOM('<!doctype html><html><body></body></html>', {
+    runScripts: 'outside-only',
+    url: 'http://localhost/',
+  });
+  vm.runInContext(I18N, dom.getInternalVMContext(), { filename: 'i18n.js' });
+  const api = (dom.window as unknown as { CodemanI18n: Api }).CodemanI18n;
+  api.configure({ language });
+  return { api, dom };
+}
+const zh = translator('zh-CN');
+const en = translator('en');
+afterAll(() => {
+  zh.dom.window.close();
+  en.dom.window.close();
+});
+
+const panelToasts = [
+  ...PANELS_UI.matchAll(/this\.showToast\('(Could not open the transcript window[^']*|Pop-up blocked[^']*)'/g),
+].map((m) => m[1]);
+// The shim's JavaScript may quote a literal either way.
+const shimToasts = [...ASSETS_RS.matchAll(/showToast\((['"])([^'"]+)\1/g)].map((m) => m[2]);
+const downloadTemplates = [...ASSETS_RS.matchAll(/format!\("([^"]*\{file_name\}[^"]*)"\)/g)].map((m) => m[1]);
+
+// File names with spaces, dots, brackets and English words, one of them a
+// dictionary word on its own ("Settings saved"), which must not be translated.
+const FILE_NAMES = ['report v2.pdf', 'Settings saved', 'a (1).tar.gz', '数据.csv'];
+
+describe('the window and desktop toasts in zh-CN', () => {
+  it('finds the strings it checks (the check is not vacuous)', () => {
+    expect(new Set(panelToasts)).toEqual(
+      new Set([
+        'Could not open the transcript window: pop-up windows are blocked here',
+        'Pop-up blocked: allow pop-ups for this site to detach previews',
+      ])
+    );
+    expect(new Set(shimToasts)).toEqual(new Set(['Could not open a new window']));
+    expect(new Set(downloadTemplates)).toEqual(
+      new Set(['Downloaded {file_name} to Downloads', 'Download of {file_name} failed'])
+    );
+  });
+
+  it('every literal toast translates, and reads the same in English', () => {
+    const bad = [...panelToasts, ...shimToasts].filter((l) => {
+      const text = zh.api.t(l);
+      return text === l || /[A-Za-z]/.test(text) || en.api.t(l) !== l;
+    });
+    expect(bad).toEqual([]);
+  });
+
+  it('the download toasts translate around the file name, which stays as written', () => {
+    for (const template of downloadTemplates) {
+      for (const name of FILE_NAMES) {
+        const source = template.replace('{file_name}', name);
+        const text = zh.api.t(source);
+        expect(text, source).not.toBe(source);
+        expect(text.split(name), source).toHaveLength(2);
+        expect(text.replace(name, ''), source).not.toMatch(/[A-Za-z]/);
+        expect(en.api.t(source)).toBe(source);
+      }
+    }
+    expect(zh.api.t('Downloaded report v2.pdf to Downloads')).toBe('已将 report v2.pdf 下载到“下载”文件夹');
+    expect(zh.api.t('Download of report v2.pdf failed')).toBe('下载 report v2.pdf 失败');
+  });
+});

test/edit-history-sync.test.ts

@@ -428,20 +428,14 @@ describe('EditHistorySync', () => {
     host.append('main', editLine('t1', T0, '/w/a.ts'));
     const orig = host.read;
     let first = true;
-    let inRead!: () => void;
-    const reachedRead = new Promise<void>((r) => (inRead = r));
     host.read = async (...a) => {
       if (first) {
         first = false;
-        inRead();
         await gate;
       }
       return orig(...a);
     };
     const slow = sync.sync(local);
-    // Only once s1 holds the gate: the sessions load their stores independently, so a later one
-    // could reach the read first, take the gate and hang the loop below before `release()`.
-    await reachedRead;
     for (let i = 1; i <= MAX_LOADED_STORES + 1; i++) await sync.sync({ ...local, id: `s1-${i}` });
     release();
     expect(await slow).toEqual({ state: 'ok' });

test/file-browser-search.test.ts

@@ -387,7 +387,7 @@ describe('File Viewer server search', () => {
 
     await vi.advanceTimersByTimeAsync(1);
     expect(pending).toHaveLength(1);
-    expect(pending[0].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=false&q=src%20%26%20docs&root=live');
+    expect(pending[0].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=false&q=src%20%26%20docs');
   });
 
   it('is a safe no-op without a panel or session and can lazily adopt a later active owner', async () => {
@@ -399,7 +399,7 @@ describe('File Viewer server search', () => {
     app.activeSessionId = 'session/B';
     app.filterFileBrowser('after-session');
     await vi.advanceTimersByTimeAsync(250);
-    expect(pending[0].url).toBe('/api/sessions/session%2FB/files?depth=5&showHidden=false&q=after-session&root=live');
+    expect(pending[0].url).toBe('/api/sessions/session%2FB/files?depth=5&showHidden=false&q=after-session');
 
     pending[0].reply.resolve(response(successfulData()));
     await vi.advanceTimersByTimeAsync(0);
@@ -450,7 +450,7 @@ describe('File Viewer server search', () => {
     expect(pending).toHaveLength(0);
     await vi.advanceTimersByTimeAsync(1);
     expect(pending.map(({ url }) => url)).toEqual([
-      '/api/sessions/session%2FA/files?depth=5&showHidden=false&q=second%20query&root=live',
+      '/api/sessions/session%2FA/files?depth=5&showHidden=false&q=second%20query',
     ]);
   });
 
@@ -659,7 +659,7 @@ describe('File Viewer server search', () => {
     await vi.advanceTimersByTimeAsync(250);
 
     expect(pending).toHaveLength(1);
-    expect(pending[0].url.endsWith(`&q=${'x'.repeat(256)}&root=live`)).toBe(true);
+    expect(pending[0].url.endsWith(`&q=${'x'.repeat(256)}`)).toBe(true);
   });
 
   it('rejects 257 trimmed characters without a request', async () => {
@@ -786,7 +786,7 @@ describe('File Viewer server search', () => {
       expect(elements.fileBrowserTree.innerHTML).toContain('Loading files');
       expect(elements.fileBrowserTree.innerHTML).not.toContain('old-result.ts');
       expect(elements.fileBrowserTree.innerHTML).not.toContain('old-preference.ts');
-      expect(pending[1].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=true&root=live');
+      expect(pending[1].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=true');
 
       pending[1].reply.resolve(response(successfulTree('new-preference.ts')));
       await toggle;
@@ -794,7 +794,7 @@ describe('File Viewer server search', () => {
       expect(app._fileBrowserState.view).toBe('search-pending');
       expect(elements.fileBrowserTree.innerHTML).toContain('Searching');
       await vi.advanceTimersByTimeAsync(250);
-      expect(pending[2].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=true&q=widget&root=live');
+      expect(pending[2].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=true&q=widget');
       pending[2].reply.resolve(
         response(
           successfulData({
@@ -877,8 +877,8 @@ describe('File Viewer server search', () => {
       const firstToggle = app.toggleFileBrowserHidden();
       const secondToggle = app.toggleFileBrowserHidden();
       expect(pending.slice(1).map(({ url }) => url)).toEqual([
-        '/api/sessions/session%2FA/files?depth=5&showHidden=true&root=live',
-        '/api/sessions/session%2FA/files?depth=5&showHidden=false&root=live',
+        '/api/sessions/session%2FA/files?depth=5&showHidden=true',
+        '/api/sessions/session%2FA/files?depth=5&showHidden=false',
       ]);
 
       pending[1].reply.resolve(response(successfulTree('stale-hidden.ts')));
@@ -891,7 +891,7 @@ describe('File Viewer server search', () => {
       await vi.advanceTimersByTimeAsync(250);
 
       expect(pending).toHaveLength(4);
-      expect(pending[3].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=false&q=widget&root=live');
+      expect(pending[3].url).toBe('/api/sessions/session%2FA/files?depth=5&showHidden=false&q=widget');
       expect(app.fileBrowserShowHidden).toBe(false);
     });
 
@@ -1674,7 +1674,7 @@ describe('File Viewer server search', () => {
       expect(immediateState.activeSessionId).toBe('session/B');
       expect(immediateState.ownerSessionId).toBe('session/B');
       expect(immediateState.resizeCalls).toBe(1);
-      expect(immediateState.fileUrls).toEqual(['/api/sessions/session%2FB/files?depth=5&showHidden=false&root=live']);
+      expect(immediateState.fileUrls).toEqual(['/api/sessions/session%2FB/files?depth=5&showHidden=false']);
 
       expect(filePending).toHaveLength(1);
       expect(app._fileBrowserState.ownerSessionId).toBe('session/B');
@@ -1755,7 +1755,7 @@ describe('File Viewer server search', () => {
       expect(elements.fileBrowserExpandBtn.innerHTML).toBe('\u229E');
       expect(elements.fileBrowserTree.querySelectorAll('.file-tree-item')).toHaveLength(0);
       expect(elements.fileBrowserTree.innerHTML).toContain('Loading files');
-      expect(pending.map(({ url }) => url)).toEqual(['/api/sessions/session%2FB/files?depth=5&showHidden=false&root=live']);
+      expect(pending.map(({ url }) => url)).toEqual(['/api/sessions/session%2FB/files?depth=5&showHidden=false']);
 
       await vi.advanceTimersByTimeAsync(250);
       expect(pending).toHaveLength(1);
@@ -1797,8 +1797,8 @@ describe('File Viewer server search', () => {
       await vi.advanceTimersByTimeAsync(250);
 
       expect(pending.map(({ url }) => url)).toEqual([
-        '/api/sessions/session%2FB/files?depth=5&showHidden=false&root=live',
-        '/api/sessions/session%2FB/files?depth=5&showHidden=false&q=during%20load&root=live',
+        '/api/sessions/session%2FB/files?depth=5&showHidden=false',
+        '/api/sessions/session%2FB/files?depth=5&showHidden=false&q=during%20load',
       ]);
       expect(pending.every(({ url }) => !url.includes('session%2FA'))).toBe(true);
     });
@@ -1815,9 +1815,9 @@ describe('File Viewer server search', () => {
 
       expect(secondA).not.toBe(firstA);
       expect(pending.map(({ url }) => url)).toEqual([
-        '/api/sessions/session%2FA/files?depth=5&showHidden=false&root=live',
-        '/api/sessions/session%2FB/files?depth=5&showHidden=false&root=live',
-        '/api/sessions/session%2FA/files?depth=5&showHidden=false&root=live',
+        '/api/sessions/session%2FA/files?depth=5&showHidden=false',
+        '/api/sessions/session%2FB/files?depth=5&showHidden=false',
+        '/api/sessions/session%2FA/files?depth=5&showHidden=false',
       ]);
 
       pending[0].reply.resolve(response(successfulTree('stale-A.ts')));

test/file-browser-worktree.test.ts

@@ -1,227 +0,0 @@
-/**
- * @fileoverview Files panel following the agent into a git worktree (#765).
- *
- * The server does the walking, so what can go wrong here is the client: asking for the wrong root,
- * showing a strip that does not describe the tree on screen, or reloading forever. The last one is
- * why the follow compares with what the listing reported rather than with the previous update.
- *
- * Loaded via `vm` with a stubbed context, like file-browser-hidden.test.ts.
- */
-import { readFileSync } from 'node:fs';
-import { resolve } from 'node:path';
-import vm from 'node:vm';
-import { describe, expect, it, vi } from 'vitest';
-
-const PUBLIC = resolve(import.meta.dirname, '../src/web/public');
-const panelsJs = readFileSync(resolve(PUBLIC, 'panels-ui.js'), 'utf8');
-const appJs = readFileSync(resolve(PUBLIC, 'app.js'), 'utf8');
-const indexHtml = readFileSync(resolve(PUBLIC, 'index.html'), 'utf8');
-const stylesCss = readFileSync(resolve(PUBLIC, 'styles.css'), 'utf8');
-
-const WORKTREE = { name: 'probe', path: '/repo/.claude/worktrees/probe' };
-
-function element() {
-  const classes = new Set<string>();
-  return {
-    innerHTML: '',
-    textContent: '',
-    title: '',
-    hidden: true,
-    value: '',
-    classList: {
-      toggle: (name: string, on: boolean) => (on ? classes.add(name) : classes.delete(name)),
-      contains: (name: string) => classes.has(name),
-    },
-    setAttribute: () => {},
-    querySelectorAll: () => [],
-  };
-}
-
-function loadPanel() {
-  const CodemanApp = function CodemanApp(this: unknown) {} as unknown as new () => Record<string, any>;
-  const context = vm.createContext({
-    CodemanApp,
-    console,
-    localStorage: { getItem: () => null, setItem: () => {}, removeItem: () => {} },
-    escapeHtml: (s: string) => String(s),
-    document: { getElementById: () => null, addEventListener: vi.fn() },
-    window: { addEventListener: vi.fn() },
-    setTimeout,
-    clearTimeout,
-    fetch: undefined as unknown,
-    CodemanBase: { url: (p: string) => p },
-  });
-  vm.runInContext(panelsJs, context, { filename: 'panels-ui.js' });
-
-  const ids = [
-    'fileBrowserPanel',
-    'fileBrowserTree',
-    'fileBrowserStatus',
-    'fileBrowserHiddenBtn',
-    'fileBrowserSearch',
-    'fileBrowserRoot',
-    'fileBrowserRootLabel',
-    'fileBrowserRootName',
-    'fileBrowserRootSwitch',
-  ];
-  const elements = Object.fromEntries(ids.map((id) => [id, element()]));
-  elements.fileBrowserPanel.classList.toggle('visible', true);
-
-  const app = new CodemanApp();
-  app.$ = (id: string) => elements[id] ?? null;
-  app.activeSessionId = 'sess-1';
-  app.fileBrowserData = null;
-  app.fileBrowserExpandedDirs = new Set<string>();
-  app.fileBrowserFilter = '';
-  app.fileBrowserShowHidden = false;
-  app.getFileIcon = () => '';
-  app.formatFileSize = () => '';
-
-  // A stand-in for the route: the session's worktree, listed when the request asks for it.
-  const server = { worktree: null as typeof WORKTREE | null, requests: [] as string[] };
-  context.fetch = async (url: string) => {
-    server.requests.push(url);
-    const live = url.includes('root=live') && server.worktree;
-    const data = {
-      root: live ? server.worktree!.path : '/repo',
-      ...(server.worktree && { worktree: server.worktree }),
-      tree: [],
-      totalFiles: 0,
-      totalDirectories: 0,
-      truncated: false,
-      ...(url.includes('q=') && { mode: 'search', matches: [], matchCount: 0 }),
-    };
-    return { ok: true, json: async () => ({ success: true, data }) };
-  };
-  return { app, elements, server };
-}
-
-const strip = (elements: Record<string, ReturnType<typeof element>>) => ({
-  hidden: elements.fileBrowserRoot.hidden,
-  label: elements.fileBrowserRootLabel.textContent,
-  name: elements.fileBrowserRootName.textContent,
-  button: elements.fileBrowserRootSwitch.textContent,
-  title: elements.fileBrowserRoot.title,
-});
-
-describe('Files panel in a git worktree', () => {
-  it('asks for the live root by default', async () => {
-    const { app, server } = loadPanel();
-    await app.loadFileBrowser('sess-1');
-    expect(server.requests[0]).toContain('root=live');
-  });
-
-  it('shows no strip for a session in no worktree', async () => {
-    const { app, elements } = loadPanel();
-    await app.loadFileBrowser('sess-1');
-    expect(elements.fileBrowserRoot.hidden).toBe(true);
-  });
-
-  it('says which worktree is listed, and offers the session folder', async () => {
-    const { app, elements, server } = loadPanel();
-    server.worktree = WORKTREE;
-    await app.loadFileBrowser('sess-1');
-    expect(strip(elements)).toEqual({
-      hidden: false,
-      label: 'Worktree',
-      name: 'probe',
-      button: 'Session folder',
-      title: WORKTREE.path,
-    });
-  });
-
-  it('switches to the session folder and back', async () => {
-    const { app, elements, server } = loadPanel();
-    server.worktree = WORKTREE;
-    await app.loadFileBrowser('sess-1');
-
-    await app.toggleFileBrowserRoot();
-    expect(server.requests[1]).not.toContain('root=live');
-    expect(strip(elements)).toEqual({
-      hidden: false,
-      label: 'Session folder',
-      name: '',
-      button: 'Back to worktree',
-      title: '/repo',
-    });
-
-    await app.toggleFileBrowserRoot();
-    expect(server.requests[2]).toContain('root=live');
-    expect(elements.fileBrowserRootName.textContent).toBe('probe');
-  });
-
-  it('keeps the query in the box across the switch, and searches the new root', async () => {
-    const { app, elements, server } = loadPanel();
-    server.worktree = WORKTREE;
-    await app.loadFileBrowser('sess-1');
-    app._fileBrowserState.filter = 'main';
-    elements.fileBrowserSearch.value = 'main';
-
-    await app.toggleFileBrowserRoot();
-    await vi.waitFor(() => expect(server.requests.some((url) => url.includes('q=main'))).toBe(true));
-
-    const search = server.requests.find((url) => url.includes('q=main'))!;
-    expect(search).not.toContain('root=live');
-  });
-
-  it('follows the agent into a worktree while the panel is open', async () => {
-    const { app, elements, server } = loadPanel();
-    await app.loadFileBrowser('sess-1');
-    expect(server.requests).toHaveLength(1);
-
-    server.worktree = WORKTREE;
-    app._followFileBrowserWorktree({ id: 'sess-1', liveWorktree: WORKTREE });
-    await vi.waitFor(() => expect(server.requests).toHaveLength(2));
-    await vi.waitFor(() => expect(elements.fileBrowserRoot.hidden).toBe(false));
-    expect(elements.fileBrowserRootName.textContent).toBe('probe');
-  });
-
-  it('follows the agent back out, and a pin on the old worktree does not outlive it', async () => {
-    const { app, elements, server } = loadPanel();
-    server.worktree = WORKTREE;
-    await app.loadFileBrowser('sess-1');
-    await app.toggleFileBrowserRoot();
-
-    server.worktree = null;
-    app._followFileBrowserWorktree({ id: 'sess-1' });
-    await vi.waitFor(() => expect(elements.fileBrowserRoot.hidden).toBe(true));
-    expect(app._fileBrowserState.sessionRootPinned).toBe(false);
-  });
-
-  it('settles: updates that agree with the listing reload nothing', async () => {
-    const { app, server } = loadPanel();
-    server.worktree = WORKTREE;
-    await app.loadFileBrowser('sess-1');
-    app._followFileBrowserWorktree({ id: 'sess-1', liveWorktree: WORKTREE });
-    app._followFileBrowserWorktree({ id: 'sess-1', liveWorktree: WORKTREE });
-    expect(server.requests).toHaveLength(1);
-  });
-
-  it('leaves another session and a closed panel alone', async () => {
-    const { app, elements, server } = loadPanel();
-    await app.loadFileBrowser('sess-1');
-    app._followFileBrowserWorktree({ id: 'other', liveWorktree: WORKTREE });
-    elements.fileBrowserPanel.classList.toggle('visible', false);
-    app._followFileBrowserWorktree({ id: 'sess-1', liveWorktree: WORKTREE });
-    expect(server.requests).toHaveLength(1);
-  });
-
-  it('drops the pin and the strip on a session switch', async () => {
-    const { app, elements, server } = loadPanel();
-    server.worktree = WORKTREE;
-    await app.loadFileBrowser('sess-1');
-    await app.toggleFileBrowserRoot();
-
-    app._activateFileBrowserSession('sess-2');
-    expect(app._fileBrowserState.sessionRootPinned).toBe(false);
-    expect(elements.fileBrowserRoot.hidden).toBe(true);
-  });
-
-  it('is wired up in the page', () => {
-    expect(appJs).toContain('this._followFileBrowserWorktree?.(session)');
-    expect(indexHtml).toContain('id="fileBrowserRoot" hidden');
-    expect(indexHtml).toContain('onclick="app.toggleFileBrowserRoot()"');
-    // The strip sets `display`, so `hidden` needs its own rule or it never hides.
-    expect(stylesCss).toMatch(/\.file-browser-root\[hidden\]\s*\{\s*display: none;/);
-  });
-});

test/live-worktree.test.ts

@@ -1,125 +0,0 @@
-/**
- * @fileoverview `findLiveWorktree()` (#765): which linked worktree a session's pane is in.
- *
- * The answer moves the Files panel's listing, so what matters is what it must NOT answer: the
- * session folder itself, a folder outside it, a plain subfolder (a `cd` in a shell must not re-root
- * the panel), a repository or submodule nested in the folder, and a `.git` that is not a regular
- * file. Runs against a real filesystem, and one case against a worktree real git made.
- */
-import { execFileSync } from 'node:child_process';
-import { mkdirSync, mkdtempSync, rmSync, symlinkSync, writeFileSync } from 'node:fs';
-import { tmpdir } from 'node:os';
-import { join } from 'node:path';
-import { afterEach, beforeEach, describe, expect, it } from 'vitest';
-import { findLiveWorktree, isLinkedWorktreeGitFile } from '../src/live-worktree.js';
-
-describe('isLinkedWorktreeGitFile', () => {
-  it('accepts what git writes for a linked worktree, absolute or relative', () => {
-    expect(isLinkedWorktreeGitFile('gitdir: /home/me/repo/.git/worktrees/probe\n')).toBe(true);
-    expect(isLinkedWorktreeGitFile('gitdir: ../../../.git/worktrees/probe\n')).toBe(true);
-  });
-
-  it('refuses a submodule, a bare path and text that is not a gitdir line', () => {
-    expect(isLinkedWorktreeGitFile('gitdir: ../.git/modules/lib\n')).toBe(false);
-    expect(isLinkedWorktreeGitFile('gitdir: worktrees\n')).toBe(false);
-    expect(isLinkedWorktreeGitFile('/home/me/repo/.git/worktrees/probe\n')).toBe(false);
-    expect(isLinkedWorktreeGitFile('')).toBe(false);
-  });
-});
-
-describe('findLiveWorktree', () => {
-  let base: string;
-  let repo: string;
-  let worktree: string;
-
-  beforeEach(() => {
-    base = mkdtempSync(join(tmpdir(), 'live-worktree-'));
-    repo = join(base, 'repo');
-    worktree = join(repo, '.claude', 'worktrees', 'probe');
-    mkdirSync(join(repo, '.git'), { recursive: true });
-    mkdirSync(join(worktree, 'src', 'deep'), { recursive: true });
-    writeFileSync(join(worktree, '.git'), `gitdir: ${repo}/.git/worktrees/probe\n`);
-  });
-
-  afterEach(() => {
-    rmSync(base, { recursive: true, force: true });
-  });
-
-  it('finds the worktree from its own root and from below it', async () => {
-    const expected = { name: 'probe', path: worktree };
-    expect(await findLiveWorktree(repo, worktree)).toEqual(expected);
-    expect(await findLiveWorktree(repo, join(worktree, 'src', 'deep'))).toEqual(expected);
-  });
-
-  it('answers the same for a workingDir spelled with a trailing slash', async () => {
-    expect(await findLiveWorktree(`${repo}/`, worktree)).toEqual({ name: 'probe', path: worktree });
-  });
-
-  it('does not treat the session folder as a worktree of itself', async () => {
-    writeFileSync(join(worktree, 'marker'), '');
-    expect(await findLiveWorktree(worktree, worktree)).toBeUndefined();
-    expect(await findLiveWorktree(worktree, join(worktree, 'src'))).toBeUndefined();
-  });
-
-  it('stays on the session folder for a plain subfolder, so a shell cd moves nothing', async () => {
-    mkdirSync(join(repo, 'src'));
-    expect(await findLiveWorktree(repo, repo)).toBeUndefined();
-    expect(await findLiveWorktree(repo, join(repo, 'src'))).toBeUndefined();
-  });
-
-  it('never answers outside the session folder', async () => {
-    const outside = join(base, 'repo-feature');
-    mkdirSync(outside);
-    writeFileSync(join(outside, '.git'), `gitdir: ${repo}/.git/worktrees/feature\n`);
-    // A sibling sharing the folder's name as a prefix is the case a bare startsWith gets wrong.
-    expect(await findLiveWorktree(repo, outside)).toBeUndefined();
-    expect(await findLiveWorktree(repo, '/')).toBeUndefined();
-  });
-
-  it('stops at a submodule and at a repository of its own', async () => {
-    const submodule = join(repo, 'lib');
-    mkdirSync(submodule);
-    writeFileSync(join(submodule, '.git'), 'gitdir: ../.git/modules/lib\n');
-    expect(await findLiveWorktree(repo, submodule)).toBeUndefined();
-
-    const nested = join(worktree, 'vendored');
-    mkdirSync(join(nested, '.git'), { recursive: true });
-    expect(await findLiveWorktree(repo, nested)).toBeUndefined();
-  });
-
-  it('refuses a .git that is not a regular file', async () => {
-    const linked = join(repo, 'linked');
-    mkdirSync(linked);
-    symlinkSync(join(worktree, '.git'), join(linked, '.git'));
-    expect(await findLiveWorktree(repo, linked)).toBeUndefined();
-
-    // A FIFO would block open() for good: the test would time out rather than fail.
-    const piped = join(repo, 'piped');
-    mkdirSync(piped);
-    execFileSync('mkfifo', [join(piped, '.git')]);
-    expect(await findLiveWorktree(repo, piped)).toBeUndefined();
-  });
-
-  it('answers nothing without an absolute reading', async () => {
-    expect(await findLiveWorktree(repo, undefined)).toBeUndefined();
-    expect(await findLiveWorktree(repo, '')).toBeUndefined();
-    expect(await findLiveWorktree(repo, '.claude/worktrees/probe')).toBeUndefined();
-  });
-
-  it('recognises a worktree real git made', async () => {
-    const real = join(base, 'real');
-    const git = (...args: string[]) =>
-      execFileSync('git', ['-c', 'user.name=t', '-c', 'user.email=t@example.com', ...args], {
-        cwd: real,
-        stdio: 'ignore',
-      });
-    mkdirSync(real);
-    git('init', '-q');
-    git('commit', '-q', '--allow-empty', '-m', 'init');
-    git('worktree', 'add', '-q', '.claude/worktrees/made', '-b', 'worktree-made');
-    expect(await findLiveWorktree(real, join(real, '.claude', 'worktrees', 'made'))).toEqual({
-      name: 'made',
-      path: join(real, '.claude', 'worktrees', 'made'),
-    });
-  });
-});

test/pane-cwd-tracking.test.ts

@@ -29,11 +29,11 @@
  *
  * Port: ephemeral
  */
-import { mkdirSync, mkdtempSync, readFileSync, realpathSync, rmSync, symlinkSync, writeFileSync } from 'node:fs';
+import { mkdirSync, mkdtempSync, readFileSync, realpathSync, rmSync, symlinkSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join, resolve } from 'node:path';
 import vm from 'node:vm';
-import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { afterEach, describe, expect, it, vi } from 'vitest';
 import { Session, rebasePath } from '../src/session.js';
 import { WebServer } from '../src/web/server.js';
 import type { SessionDocker, SessionRemote } from '../src/types.js';
@@ -278,77 +278,6 @@ describe('a pane read reaching the session record', () => {
     expect(session.toState().workingDir).toBe('/work/proj');
   });
 
-  describe('liveWorktree (#765)', () => {
-    let base: string;
-    let repo: string;
-    let worktree: string;
-
-    beforeEach(() => {
-      base = mkdtempSync(join(tmpdir(), 'pane-live-worktree-'));
-      repo = join(base, 'repo');
-      worktree = join(repo, '.claude', 'worktrees', 'probe');
-      mkdirSync(worktree, { recursive: true });
-      writeFileSync(join(worktree, '.git'), `gitdir: ${repo}/.git/worktrees/probe\n`);
-    });
-
-    afterEach(() => {
-      rmSync(base, { recursive: true, force: true });
-    });
-
-    const inRepo = () => {
-      const { mux, sessions, web } = build();
-      const session = localMuxSession({ workingDir: repo });
-      sessions.set(session.id, session);
-      const broadcast = vi.fn();
-      (web as unknown as { broadcastSessionStateDebounced: (id: string) => void }).broadcastSessionStateDebounced =
-        broadcast;
-      mux.getPaneExit = () => undefined;
-      return { mux, session, web, broadcast };
-    };
-
-    it('publishes the worktree the pane moved into, and clears it when the pane leaves', async () => {
-      const { mux, session, web, broadcast } = inRepo();
-      let dir = worktree;
-      mux.getPaneCurrentPath = () => dir;
-      mux.emit('paneExitsUpdated');
-      await vi.waitFor(() => expect(session.liveWorktree).toEqual({ name: 'probe', path: worktree }));
-      // What the browser receives, and what the file routes read: never the confinement root.
-      const state = (
-        web as unknown as { getSessionStateWithRespawn: (s: Session) => { liveWorktree?: unknown } }
-      ).getSessionStateWithRespawn(session);
-      expect(state.liveWorktree).toEqual({ name: 'probe', path: worktree });
-      expect(session.toState().workingDir).toBe(repo);
-
-      const broadcasts = broadcast.mock.calls.length;
-      dir = repo;
-      mux.emit('paneExitsUpdated');
-      await vi.waitFor(() => expect(session.liveWorktree).toBeUndefined());
-      expect(broadcast.mock.calls.length).toBeGreaterThan(broadcasts);
-    });
-
-    it('does nothing for a pane that has not moved', async () => {
-      const { mux, session } = inRepo();
-      mux.getPaneCurrentPath = () => repo;
-      const lookup = vi.spyOn(session, 'setLiveWorktree');
-      mux.emit('paneExitsUpdated');
-      await vi.waitFor(() => expect(lookup).toHaveBeenCalledTimes(1));
-      mux.emit('paneExitsUpdated');
-      await new Promise((resolve) => setTimeout(resolve, 20));
-      expect(lookup).toHaveBeenCalledTimes(1);
-    });
-
-    it('drops an answer for a directory the pane has already left', async () => {
-      const { web, session } = inRepo();
-      session.setPaneCwd(worktree);
-      const refresh = (
-        web as unknown as { refreshLiveWorktree: (s: Session) => Promise<void> }
-      ).refreshLiveWorktree.call(web, session);
-      session.setPaneCwd(repo);
-      await refresh;
-      expect(session.liveWorktree).toBeUndefined();
-    });
-  });
-
   it('broadcasts a directory change once, and nothing on an unchanged tick', () => {
     const { mux, sessions } = build();
     const session = localMuxSession();

test/routes/file-routes-live-worktree.test.ts

@@ -1,105 +0,0 @@
-/**
- * @fileoverview `GET /api/sessions/:id/files?root=live` (#765).
- *
- * The listing starts at the worktree the pane is in, and every `path` stays relative to
- * `workingDir`: that is what keeps the preview, raw and edit routes working unchanged, inside the
- * same confinement. Real filesystem on purpose, since the walk is the thing under test.
- */
-import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
-import { homedir } from 'node:os';
-import { join } from 'node:path';
-import { afterEach, beforeEach, describe, expect, it } from 'vitest';
-import { createRouteTestHarness, type RouteTestHarness } from './_route-test-utils.js';
-import { registerFileRoutes } from '../../src/web/routes/file-routes.js';
-
-const PREFIX = '.claude/worktrees/probe';
-
-describe('Files panel listing of a live worktree', () => {
-  let harness: RouteTestHarness;
-  let repo: string;
-  let worktree: string;
-
-  const list = async (query = '') => {
-    const res = await harness.app.inject({
-      method: 'GET',
-      url: `/api/sessions/${harness.ctx._sessionId}/files?depth=5${query}`,
-    });
-    expect(res.statusCode).toBe(200);
-    return res.json().data;
-  };
-  const names = (nodes: Array<{ name: string }>) => nodes.map((node) => node.name);
-
-  beforeEach(async () => {
-    harness = await createRouteTestHarness(registerFileRoutes);
-    repo = mkdtempSync(join(homedir(), 'live-worktree-route-'));
-    worktree = join(repo, PREFIX);
-    mkdirSync(join(repo, 'src'), { recursive: true });
-    mkdirSync(join(worktree, 'src'), { recursive: true });
-    writeFileSync(join(repo, 'src', 'main-only.ts'), 'main');
-    writeFileSync(join(worktree, 'src', 'worktree-only.ts'), 'worktree');
-    Object.assign(harness.ctx._session, {
-      workingDir: repo,
-      liveWorktree: { name: 'probe', path: worktree },
-    });
-  });
-
-  afterEach(async () => {
-    await harness.app.close();
-    rmSync(repo, { recursive: true, force: true });
-  });
-
-  it('lists the worktree with paths relative to the session folder', async () => {
-    const data = await list('&root=live');
-    expect(data.root).toBe(worktree);
-    expect(data.worktree).toEqual({ name: 'probe', path: worktree });
-    expect(names(data.tree)).toEqual(['src']);
-    expect(data.tree[0].path).toBe(`${PREFIX}/src`);
-    expect(data.tree[0].children[0].path).toBe(`${PREFIX}/src/worktree-only.ts`);
-  });
-
-  it('does not need hidden files on, though the worktree lives under a dot folder', async () => {
-    const data = await list('&root=live&showHidden=false');
-    expect(data.totalFiles).toBe(1);
-  });
-
-  it('keeps the session folder without the parameter, and still reports the worktree', async () => {
-    const data = await list();
-    expect(data.root).toBe(repo);
-    expect(data.worktree).toEqual({ name: 'probe', path: worktree });
-    expect(names(data.tree)).toEqual(['src']);
-    expect(data.tree[0].children[0].path).toBe('src/main-only.ts');
-  });
-
-  it('answers exactly as before for a session in no worktree', async () => {
-    Object.assign(harness.ctx._session, { liveWorktree: undefined });
-    const data = await list('&root=live');
-    expect(data).toEqual(await list());
-    expect(data.root).toBe(repo);
-    expect('worktree' in data).toBe(false);
-  });
-
-  it('falls back to the session folder when the worktree has gone, keeping the report', async () => {
-    rmSync(worktree, { recursive: true });
-    const data = await list('&root=live');
-    expect(data.root).toBe(repo);
-    // Kept so the panel's comparison with the session's state settles instead of reloading forever.
-    expect(data.worktree).toEqual({ name: 'probe', path: worktree });
-  });
-
-  it('searches the worktree: the query reads paths in the listing, the result in the session folder', async () => {
-    const data = await list(`&root=live&q=${encodeURIComponent('src/*.ts')}`);
-    expect(data.root).toBe(worktree);
-    expect(data.matches.map((match: { path: string }) => match.path)).toEqual([`${PREFIX}/src/worktree-only.ts`]);
-    expect(data.worktree).toEqual({ name: 'probe', path: worktree });
-  });
-
-  it('serves a listed path through the unchanged preview route', async () => {
-    const path = `${PREFIX}/src/worktree-only.ts`;
-    const res = await harness.app.inject({
-      method: 'GET',
-      url: `/api/sessions/${harness.ctx._sessionId}/file-content?path=${encodeURIComponent(path)}`,
-    });
-    expect(res.json().success).toBe(true);
-    expect(res.json().data.content).toBe('worktree');
-  });
-});