fix(settings): harden case sync (privacy, concurrent saves, failures, enable/disable)

- Redact caseSettings for non-admins and never apply a shared map on a read-only page (CASE-SYNC-001)
- Send one case per save and merge it inside mutateSettingsFile, so devices cannot discard each other's cases; rapid saves keep their order (CASE-SYNC-002)
- Check HTTP status and the response body, keep the local choice, report an unsynced save and reuse the forbidden-write handling (CASE-SYNC-003)
- Let the server decide whether sync is on: refresh the cached switch, discard stale refreshes (CASE-SYNC-004)
- Carry shared options through case rename and drop them on delete or unlink
- Give the switch an accessible name; add server, client and two-browser tests

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/wiki/Settings-Reference.md

@@ -230,7 +230,7 @@ on. Details: [Custom Model Endpoints](Custom-Model-Endpoints#a-model-that-runs-o
 | Bypass approvals and sandbox     | Starts new Codex sessions with `--dangerously-bypass-approvals-and-sandbox`. Read [Agent CLIs](Agent-CLIs) before enabling. |
 | Allow network access             | Starts new local Codex sessions (Run menu, Resume and the API; not scheduled jobs) with `sandbox_workspace_write.network_access=true`, so commands in Codex's workspace-write sandbox can use the network. The [Codeman Skill](Codeman-Skill) needs it to reach this server from a Codex session. It applies to every such session, and those commands can then call Codeman's API, which can start a session outside the sandbox with no approval prompt, even when a password is set: see [Security](Security#what-codeman-does-not-protect-against). It applies where Codex runs the folder in workspace-write (a project you trusted in Codex) and does not change Codex's sandbox mode: a folder Codex runs read-only keeps the network closed, and Codex asks for approval per command. Synced, off by default; forced off for users without the privileged-commands grant in multi-user mode. |
 | Animated status effects          | Cosmetic.                                                                                      |
-| Sync cases across devices        | Keeps each case's **Agent Teams** and **Opus 1M** options on the server (`caseSettings` in `settings.json`) and, when you return to a tab, switches it to the case you last chose on another device. Synced, off by default. Without it each browser keeps its own options for a case (the case list itself is always shared). The case names are stored in the shared settings file, so a non-admin in multi-user mode neither writes nor follows them. A device that already has options for a case keeps them until a device changes that case's options while this is on. |
+| Sync cases across devices        | Keeps each case's **Agent Teams** and **Opus 1M** options on the server (`caseSettings` in `settings.json`) and, when you return to a tab, switches it to the case you last chose on another device. Synced, off by default. Without it each browser keeps its own options for a case (the case list itself is always shared). The case names are stored in the shared settings file, so a non-admin in multi-user mode neither reads, writes nor follows them. Each save sends only that case and the server merges it, so devices saving different cases never overwrite each other; a case renamed in Codeman keeps its options, and deleting or unlinking it removes them. A save the server refuses leaves the choice on that device and says so. If another device turns this off, this one stops following. A device that already has options for a case keeps them until a device changes that case's options while this is on. |
 | MCP server sync                  | Copies the MCP servers each installed, enabled CLI (Claude, Codex, Gemini, OpenCode, Antigravity) and GitHub Copilot CLI has into the others' own config files. Synced, off by default, admin only in multi-user mode. Turn it on and **Apply** or **Save** (Apply keeps Settings open), then **Preview** shows what would change and **Sync now** applies it. It only adds missing servers, keeps the previous file as `.codeman-bak`, and leaves a file that receives env values or headers readable by you only. A config dir moved by `CODEX_HOME`, `CLAUDE_CONFIG_DIR`, `XDG_CONFIG_HOME`, `GEMINI_CLI_HOME` or `COPILOT_HOME` in Codeman's own environment is followed. |
 
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