feat(mobile): bigger green working dot on tabs; Tab key replaces /clear in the simple keyboard bar

The working dot is the one glance-state a phone needs: busy tabs now get a
9px pulsing dot with a green glow (idle stays 4px). The glow needs !important
because the skin block's no-halo rule outranks mobile.css.

The simple keyboard accessory bar swaps /clear for Tab (/clear and /compact
stay in the extended bar with their double-tap confirm). The tab action now
flushes locally-buffered prompt text to the PTY before sending \t, so
completion applies to what was just typed instead of an empty composer.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/web/public/keyboard-accessory.js

@@ -4,10 +4,12 @@
  * Defines three exports:
  *
  * - KeyboardAccessoryBar (singleton object) — Quick action buttons shown above the virtual
- *   keyboard on mobile: arrow up/down, /init, /clear, /compact, paste, Esc, and dismiss.
+ *   keyboard on mobile: arrow up/down, /init, Tab, paste, Esc, and dismiss (the extended
+ *   bar adds /clear, /compact, Shift+Tab and more). Tab flushes any locally-buffered
+ *   prompt text to the PTY before sending \t, so completion applies to what was typed.
  *   The paste button opens a dialog that handles both text paste and image attach
  *   (native picker + best-effort image paste, routed through app._uploadAndInsertImages).
- *   Destructive actions (/clear, /compact) require double-tap confirmation (2s amber state).
+ *   Destructive actions (/clear, /compact, extended bar only) require double-tap confirmation (2s amber state).
  *   Commands are sent as text + Enter separately for Ink compatibility.
  *   Only initializes on touch devices (MobileDetection.isTouchDevice guard).
  * - PathPicker (singleton object) — Lazy server-side file/folder browser shared
@@ -432,7 +434,7 @@ const KeyboardAccessoryBar = {
         </svg>
       </button>
       <button class="accessory-btn" data-action="init" title="/init">/init</button>
-      <button class="accessory-btn" data-action="clear" title="/clear">/clear</button>
+      <button class="accessory-btn" data-action="tab" title="Tab">Tab</button>
       <button class="accessory-btn" data-action="paste" title="Paste from clipboard">
         <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
           <path d="M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2"/>
@@ -562,9 +564,26 @@ const KeyboardAccessoryBar = {
       case 'opt-enter':
         this.sendKey('\x1b\r');
         break;
-      case 'tab':
+      case 'tab': {
-        this.sendKey('\t');
+        // Tab means "complete what I just typed", but with local echo the typed
+        // text is still buffered in the overlay and has never reached the PTY —
+        // a bare \t would ask the CLI to complete an empty composer. Flush the
+        // pending text first (same steps as the Shift+Enter branch in
+        // terminal-ui.js), then send \t after the sendCommand settle delay.
+        const overlay = app._localEchoOverlay;
+        const pending = (app._localEchoEnabled && overlay?.pendingText) || '';
+        if (pending) {
+          overlay.clear();
+          overlay.suppressBufferDetection?.();
+          app._flushedOffsets?.delete(app.activeSessionId);
+          app._flushedTexts?.delete(app.activeSessionId);
+          app.sendInput(pending);
+          setTimeout(() => this.sendKey('\t'), 120);
+        } else {
+          this.sendKey('\t');
+        }
         break;
+      }
       case 'shift-tab':
         this.sendKey('\x1b[Z');
         break;

src/web/public/mobile.css

@@ -621,6 +621,16 @@ html.mobile-init .file-browser-panel {
     height: 4px;
   }
 
+  /* The working dot is the one glance-state a phone needs: keep idle tiny, but
+     let the pulsing green "working" dot read from arm's length. !important on
+     the glow because the skin block's no-halo rule (styles.css, nested under
+     html:not([data-skin="og"])) outranks any plain class rule here. */
+  .session-tab .tab-status.busy {
+    width: 9px;
+    height: 9px;
+    box-shadow: 0 0 8px 2px color-mix(in srgb, var(--green) 55%, transparent) !important;
+  }
+
   /* Truncate tab names more aggressively on mobile */
   .session-tab .tab-name {
     max-width: 50px;

test/mobile/keyboard.test.ts

@@ -469,7 +469,9 @@ describe('Virtual Keyboard', () => {
           (button) => (button as HTMLElement).dataset.action
         );
       });
-      expect(actions).toEqual(['scroll-up', 'scroll-down', 'init', 'clear', 'paste', 'dismiss']);
+      // Tab replaced /clear in the simple bar; /clear and /compact live in the
+      // extended bar only.
+      expect(actions).toEqual(['scroll-up', 'scroll-down', 'init', 'tab', 'paste', 'esc', 'dismiss']);
     });
 
     it('double-tap confirm on /clear button', async () => {
@@ -477,9 +479,11 @@ describe('Virtual Keyboard', () => {
       await showKeyboard(page, KEYBOARD.TYPICAL_IOS_HEIGHT);
       await page.waitForTimeout(WAIT.KEYBOARD_ANIMATION);
 
-      // handleAction() early-returns if app.activeSessionId is falsy — mock it
+      // handleAction() early-returns if app.activeSessionId is falsy — mock it.
+      // /clear only exists in the extended bar now, so switch modes first.
       await page.evaluate(`
         if (typeof app !== 'undefined') app.activeSessionId = 'test-session';
+        KeyboardAccessoryBar.setMode('extended');
       `);
 
       // Click via JS since the button is positioned outside the viewport
@@ -503,6 +507,8 @@ describe('Virtual Keyboard', () => {
         return btn?.textContent?.trim();
       });
       expect(text).toBe('Tap again');
+
+      await page.evaluate(`KeyboardAccessoryBar.setMode('simple');`);
     });
 
     it('double-tap expires after 2s', async () => {
@@ -511,6 +517,7 @@ describe('Virtual Keyboard', () => {
 
       await page.evaluate(`
         if (typeof app !== 'undefined') app.activeSessionId = 'test-session';
+        KeyboardAccessoryBar.setMode('extended');
       `);
 
       // First tap on clear via JS
@@ -535,6 +542,8 @@ describe('Virtual Keyboard', () => {
         return btn?.classList.contains('confirming') ?? false;
       });
       expect(afterExpiry).toBe(false);
+
+      await page.evaluate(`KeyboardAccessoryBar.setMode('simple');`);
     });
 
     it('dismiss button blurs active element', async () => {

test/path-picker-ui.test.ts

@@ -45,11 +45,12 @@ function loadKeyboardModule() {
     insertTerminalText: vi.fn(),
     sendInput: vi.fn(),
   };
+  const fetchMock = vi.fn(() => Promise.resolve({ ok: true }));
   const context = vm.createContext({
     app,
     MobileDetection: { isTouchDevice: () => false },
     URLSearchParams,
-    fetch: vi.fn(),
+    fetch: fetchMock,
     document: {},
     setTimeout: (fn: () => void) => {
       fn();
@@ -63,11 +64,66 @@ function loadKeyboardModule() {
   );
   return {
     app,
+    fetchMock,
     bar: (context as unknown as { __bar: { handleAction(action: string): void } }).__bar,
     picker: (context as unknown as { __picker: { open: ReturnType<typeof vi.fn> } }).__picker,
   };
 }
 
+describe('accessory Tab key', () => {
+  it('replaced /clear in the simple bar; /clear stays extended-only', () => {
+    const simple = keyboardSource.slice(
+      keyboardSource.indexOf('_simpleButtons'),
+      keyboardSource.indexOf('_extendedButtons')
+    );
+    expect(simple).toContain('data-action="tab"');
+    expect(simple).not.toContain('data-action="clear" title="/clear"');
+    expect(simple).not.toContain('data-action="compact"');
+  });
+
+  it('sends a bare \\t when nothing is buffered locally', () => {
+    const { app, bar, fetchMock } = loadKeyboardModule();
+    bar.handleAction('tab');
+
+    expect(app.sendInput).not.toHaveBeenCalled();
+    expect(fetchMock).toHaveBeenCalledOnce();
+    const [url, init] = fetchMock.mock.calls[0];
+    expect(url).toBe('/api/sessions/session-1/input');
+    expect(JSON.parse(init.body)).toEqual({ input: '\t' });
+  });
+
+  it('flushes locally-buffered prompt text to the PTY before sending Tab', () => {
+    const { app, bar, fetchMock } = loadKeyboardModule() as ReturnType<typeof loadKeyboardModule> & {
+      app: Record<string, unknown>;
+    };
+    const overlay = {
+      pendingText: 'git sta',
+      clear: vi.fn(),
+      suppressBufferDetection: vi.fn(),
+    };
+    Object.assign(app, {
+      _localEchoEnabled: true,
+      _localEchoOverlay: overlay,
+      _flushedOffsets: new Map([['session-1', 3]]),
+      _flushedTexts: new Map([['session-1', 'git']]),
+    });
+
+    bar.handleAction('tab');
+
+    expect(overlay.clear).toHaveBeenCalledOnce();
+    expect(overlay.suppressBufferDetection).toHaveBeenCalledOnce();
+    expect((app as { _flushedOffsets: Map<string, number> })._flushedOffsets.has('session-1')).toBe(false);
+    expect((app as { _flushedTexts: Map<string, string> })._flushedTexts.has('session-1')).toBe(false);
+    expect(app.sendInput).toHaveBeenCalledWith('git sta');
+    expect(fetchMock).toHaveBeenCalledOnce();
+    expect(JSON.parse(fetchMock.mock.calls[0][1].body)).toEqual({ input: '\t' });
+    // Text must reach the PTY before the completion request.
+    const sendInputOrder = (app.sendInput as ReturnType<typeof vi.fn>).mock.invocationCallOrder[0];
+    const fetchOrder = fetchMock.mock.invocationCallOrder[0];
+    expect(sendInputOrder).toBeLessThan(fetchOrder);
+  });
+});
+
 describe('mobile filesystem picker actions', () => {
   it('keeps clear-input separate from the destructive /clear command', () => {
     const { app, bar } = loadKeyboardModule();