fix(mobile): terminal and layout fixes for touch devices

Mobile-focused fixes for the web UI: keyboard-accessory layout and
overlap, native input visibility above the keyboard, CJK input handling,
terminal touch scrolling, tab-menu tap targets, mic-recording glow
containment, and mobile resize/keyboard-state handling on tab switch,
plus mobile visual-regression test coverage and snapshots.

Co-Authored-By: Saqeb Akhter <saqeb.akhter@gmail.com>

test/session-resize-arbitration.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, it, vi } from 'vitest';
+import { Session } from '../src/session.js';
+
+type ResizeableSessionInternals = {
+  ptyProcess: { resize: (cols: number, rows: number) => void };
+  _ptyCols: number;
+  _ptyRows: number;
+};
+
+function attachFakePty(session: Session, cols = 160, rows = 48) {
+  const resize = vi.fn();
+  const internals = session as unknown as ResizeableSessionInternals;
+  internals.ptyProcess = { resize };
+  internals._ptyCols = cols;
+  internals._ptyRows = rows;
+  return resize;
+}
+
+describe('Session resize arbitration', () => {
+  it('ignores mobile resizes that would shrink a wider desktop PTY', () => {
+    const session = new Session({ workingDir: '/tmp', mode: 'shell' });
+    const resize = attachFakePty(session, 160, 48);
+
+    session.resize(48, 28, { viewportType: 'mobile' });
+
+    expect(resize).not.toHaveBeenCalled();
+  });
+
+  it('allows desktop resizes to change the shared PTY dimensions', () => {
+    const session = new Session({ workingDir: '/tmp', mode: 'shell' });
+    const resize = attachFakePty(session, 160, 48);
+
+    session.resize(120, 40, { viewportType: 'desktop' });
+
+    expect(resize).toHaveBeenCalledWith(120, 40);
+  });
+});