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-manager.test.ts

@@ -81,6 +81,10 @@ vi.mock('../src/session.js', () => {
       return undefined;
     }
 
+    getAttachmentHistoryForPersist() {
+      return undefined;
+    }
+
     getOutput() {
       return 'mock output';
     }