Add Close All / Others / To-the-Right tab actions (#748) (#764)

Adds three bulk-close items to the right-click context menu on tabs:
- Close Others
- Close Tabs to the Right
- Close All

Anchor is the right-clicked tab (matches VSCode/JetBrains/FinalShell
UX), not the active tab. The "to the right" item is disabled when the
anchor is already the rightmost tab; "Close Others" is disabled when
it's the only tab.

To avoid spamming a busy-shell modal per tab, the new closeTabsBatch
helper in App.tsx expands workspace ids into their session ids, runs
ONE confirmIfBusyLocalTerminal probe across the whole batch, and only
proceeds when the user confirms. The probe + close path itself reuses
the existing PR #739 plumbing (ptyProcessTree + confirmCloseBusy).

Closes #748

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

App.tsx

@@ -1068,6 +1068,50 @@ function App({ settings }: { settings: SettingsState }) {
     [sessions, t],
   );
 
+  const closeTabsInFlightRef = useRef(false);
+
+  // Close many tabs at once with a single batched busy-shell confirmation.
+  // Used by the "Close all / Close others / Close to the right" context-menu
+  // actions on tabs (#748).
+  const closeTabsBatch = useCallback(
+    async (targetIds: string[]) => {
+      if (targetIds.length === 0) return;
+      if (closeTabsInFlightRef.current) return;
+
+      // Expand workspace ids into their constituent session ids so the busy
+      // probe sees every local shell that's about to be killed.
+      const sessionIdsToProbe: string[] = [];
+      for (const tabId of targetIds) {
+        const ws = workspaces.find((w) => w.id === tabId);
+        if (ws) {
+          for (const s of sessions) {
+            if (s.workspaceId === tabId) sessionIdsToProbe.push(s.id);
+          }
+        } else if (sessions.find((s) => s.id === tabId)) {
+          sessionIdsToProbe.push(tabId);
+        }
+      }
+
+      closeTabsInFlightRef.current = true;
+      try {
+        const ok = await confirmIfBusyLocalTerminal(sessionIdsToProbe);
+        if (!ok) return;
+        for (const tabId of targetIds) {
+          if (workspaces.find((w) => w.id === tabId)) {
+            closeWorkspace(tabId);
+          } else if (sessions.find((s) => s.id === tabId)) {
+            closeSession(tabId);
+          } else if (logViews.find((lv) => lv.id === tabId)) {
+            closeLogView(tabId);
+          }
+        }
+      } finally {
+        closeTabsInFlightRef.current = false;
+      }
+    },
+    [workspaces, sessions, logViews, confirmIfBusyLocalTerminal, closeWorkspace, closeSession, closeLogView],
+  );
+
   // Shared hotkey action handler - used by both global handler and terminal callback
   const executeHotkeyAction = useCallback((action: string, e: KeyboardEvent) => {
     // Build complete tab list: vault + (sftp when visible) + sessions/workspaces.
@@ -1630,6 +1674,7 @@ function App({ settings }: { settings: SettingsState }) {
         onRenameWorkspace={startWorkspaceRename}
         onCloseWorkspace={closeWorkspace}
         onCloseLogView={closeLogView}
+        onCloseTabsBatch={closeTabsBatch}
         onOpenQuickSwitcher={handleOpenQuickSwitcher}
         onToggleTheme={handleToggleTheme}
         onOpenSettings={handleOpenSettings}