fix(terminal): use stale-title flag instead of overwriting inst.title

The previous approach (b51de0b) directly overwrote inst.title when
the foreground process returned to the shell, which broke Linux where
bash sets the title via PS1 escape sequences on each prompt. Replace
with a _titleStale flag that is set on non-shell→shell transitions
and cleared when onTitleChange fires, so shells that emit title
sequences (bash/Linux) work correctly while shells that don't (zsh/Mac)
still show the profile name instead of stale child titles.

Also fix the Linux integration test to trigger a prompt refresh
(echo + enter) after shell init so PS1 title escapes fire reliably.

Author: abose

src/extensionsIntegrated/Terminal/main.js

@@ -391,9 +391,14 @@ define(function (require, exports, module) {
     }
 
     /**
-     * Handle terminal title change — also fetches and displays the foreground process
+     * Handle terminal title change — also fetches and displays the foreground process.
+     * Clears the stale-title flag since the shell has provided its own title.
      */
     function _onTerminalTitleChanged(id, title) {
+        const instance = terminalInstances.find(t => t.id === id);
+        if (instance) {
+            instance._titleStale = false;
+        }
         _updateFlyout();
         _updateTabProcess(id);
     }
@@ -409,17 +414,18 @@ define(function (require, exports, module) {
         nodeConnector.execPeer("getTerminalProcess", {id}).then(function (result) {
             const newProc = result.process || "";
             if (processInfo[id] !== newProc) {
+                const oldProc = processInfo[id];
                 processInfo[id] = newProc;
-                // When a child process (e.g. "claude") exits and the
-                // shell regains foreground, the child may have set a
-                // custom terminal title via escape sequences. Shells
-                // like zsh on macOS do not emit a title reset, so
-                // inst.title stays stale. Reset it only when the
-                // foreground process returns to the shell. If the
-                // shell does emit a title change, onTitleChange will
-                // overwrite this immediately.
-                if (_isShellProcess(newProc)) {
-                    instance.title = instance.shellProfile.name;
+                // When a child process exits and the shell regains
+                // foreground, the child may have set a custom title
+                // via escape sequences. Some shells (e.g. zsh on
+                // macOS) don't emit a title reset, leaving inst.title
+                // stale. Mark it so _updateFlyout can fall back to
+                // the profile name. If the shell DOES emit a title
+                // change (e.g. bash on Linux), _onTerminalTitleChanged
+                // clears this flag immediately.
+                if (oldProc && !_isShellProcess(oldProc) && _isShellProcess(newProc)) {
+                    instance._titleStale = true;
                 }
                 _updateFlyout();
             }
@@ -461,13 +467,16 @@ define(function (require, exports, module) {
             const proc = processInfo[inst.id] || "";
             const basename = proc ? proc.split("/").pop().split("\\").pop() : "";
 
-            // Label: process basename; right side: cwd basename; tooltip: full title
+            // Label: process basename; right side: cwd basename; tooltip: full title.
+            // If the title is stale (child set it and the shell didn't reset it),
+            // fall back to the shell profile name.
             const label = basename || "Terminal";
-            const cwdName = _extractCwdBasename(inst.title);
+            const displayTitle = inst._titleStale ? inst.shellProfile.name : inst.title;
+            const cwdName = _extractCwdBasename(displayTitle);
 
             const $item = $('<div class="terminal-flyout-item"></div>')
                 .attr("data-terminal-id", inst.id)
-                .attr("title", inst.title)
+                .attr("title", displayTitle)
                 .toggleClass("active", inst.id === activeTerminalId);
 
             if (!inst.isAlive) {

test/spec/Terminal-integ-test.js

@@ -224,6 +224,11 @@ define(function (require, exports, module) {
                     } else {
                         // On Linux, bash/zsh set the title to
                         // include the cwd (e.g. "user@host: /path").
+                        // Wait for shell ready first, then trigger
+                        // a prompt refresh so PS1 title escapes fire.
+                        await waitForShellReady();
+                        await writeToTerminal("echo\r");
+
                         const expectedPath = getNativeProjectPath();
                         const projectDirName = expectedPath
                             .split("/").pop().split("\\").pop();