fix: apply the review items for #712 at merge

- session-ui.js _reloadCasesAfterRun: reload onto the toolbar's own case after every launch, not only one that names its case; comment updated
- test/tab-new-session.test.ts: a worktree tab's "+" Claude launch, the toolbar Run and a group's "New session" each keep the toolbar's case after a "+" moved lastUsedCase (fail without the fix); the reload setup is shared with the existing lastUsedCase test
- docs/architecture-invariants.md:349: the _reloadCasesAfterRun sentence covers every launch
- app.js _openTabLayoutMenu focusout: focus landing on the trigger is not a departure, so pressing the "+" again closes its picker in a real browser
- tab-rail-resize.js openTabRailActionMenu: close the group menu too, so the rail's ... pressed again does not leave the picker beside the row menu
- tab-rail-resize.js:329-331: the "New session here…" comment no longer says Enter on the "+" does nothing

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

src/web/public/app.js

@@ -8615,10 +8615,12 @@ class CodemanApp {
     // menu's own items are not a departure, and neither is focus going nowhere:
     // Safari never focuses a clicked button, so a press on an item blurs the
     // focused one with no relatedTarget, and closing then dropped its click
-    // (the tile count menu's rule, tile-grid.js).
+    // (the tile count menu's rule, tile-grid.js). Nor is focus landing on the
+    // trigger: a press on a focusable one (a tab's "+") focuses it before its
+    // click, and closing there let that click open the menu again.
     menu.addEventListener('focusout', (focusEvent) => {
       const to = focusEvent.relatedTarget;
-      if (!to || menu.contains(to)) return;
+      if (!to || menu.contains(to) || trigger?.contains?.(to)) return;
       if (this._tabGroupMenu === menu) this.closeTabGroupMenu();
     });
     (menu.querySelector('button.selected') || menu.querySelector('button'))?.focus();

src/web/public/session-ui.js

@@ -2025,12 +2025,14 @@ Object.assign(CodemanApp.prototype, {
   },
 
   /**
-   * Re-reads the case list after a launch. The no-argument reload re-selects the
-   * server's `lastUsedCase`, which quick-start has just set to the launched case,
-   * so a launch in a case it names (a tab's "+") keeps the toolbar on its own.
+   * Re-reads the case list after a launch, keeping the toolbar on its own case.
+   * The no-argument reload would re-select the server's `lastUsedCase`, and a
+   * tab's "+" launching through quick-start sets that to the tab's case while the
+   * toolbar stays where it was, so every later launch (a worktree's, a plain Run,
+   * a group's "New session") would otherwise move the toolbar there.
    */
-  _reloadCasesAfterRun(options) {
-    this.loadQuickStartCases(options.caseName ? document.getElementById('quickStartCase').value : null);
+  _reloadCasesAfterRun() {
+    this.loadQuickStartCases(document.getElementById('quickStartCase').value || null);
   },
 
   async runClaude(options = {}) {
@@ -2142,7 +2144,7 @@ Object.assign(CodemanApp.prototype, {
         this._appendSessionLaunchStatus(ownsLaunchTerminal, `All ${tabCount} remote session(s) ready`);
         if (remoteIds[0]) {
           await this.selectSession(remoteIds[0]);
-          this._reloadCasesAfterRun(options);
+          this._reloadCasesAfterRun();
         }
         this.terminal.focus();
         return;
@@ -2221,7 +2223,7 @@ Object.assign(CodemanApp.prototype, {
       // Auto-switch to the new session using selectSession (does proper refresh)
       if (firstSessionId) {
         await this.selectSession(firstSessionId);
-        this._reloadCasesAfterRun(options);
+        this._reloadCasesAfterRun();
       }
 
       this.terminal.focus();

src/web/public/tab-rail-resize.js

@@ -319,6 +319,7 @@ Object.assign(CodemanApp.prototype, {
     event.preventDefault();
     event.stopPropagation();
     this.closeTabRailActionMenu();
+    this.closeTabGroupMenu?.();
     const trigger = event.currentTarget;
     const menu = document.createElement('div');
     menu.className = 'tab-rail-action-menu';
@@ -327,8 +328,8 @@ Object.assign(CodemanApp.prototype, {
     const settings = this.loadAppSettingsFromStorage();
     const actions = [
       { label: 'Session options', run: () => this.openSessionOptions(sessionId) },
-      // The row's "+" (showTabNewButton on) as a menu item: its keyboard route, since
-      // Enter on the "+" itself does nothing, and its only route in the compact rail,
+      // The row's "+" (showTabNewButton on) as a menu item: a keyboard route beside
+      // Enter or Space on the "+" itself, and its only route in the compact rail,
       // which hides it. Session rows only: tiles share this menu and carry no "+".
       ...(document.documentElement.classList.contains('tabs-show-new') && trigger.closest('.session-tab')
         ? [{ label: 'New session here…', run: () => this.openTabNewSessionMenu({ currentTarget: trigger }, sessionId) }]