[Bug] aria-live="polite" on entire tone panel causes excessive screen reader announcements

[Aster1630]

Describe the bug

The writing assistant panel element (#mt-panel) has aria-live="polite" set on it directly. This means every change to any content inside the panel tone label, suggestions, grammar issues, stats, server status dot triggers a screen reader announcement. For a user typing a document, this results in a constant stream of interruptions as the panel updates in real time.

To reproduce

1. Enable a screen reader (e.g. VoiceOver, NVDA).
2. Open a supported page (Gmail, a contenteditable field, etc.).
3. Begin typing a message of 15+ words to trigger the panel.
4. Continue typing the screen reader announces panel updates on every debounce cycle.

Expected behavior

aria-live should be scoped only to the suggestions container (#mt-suggestions) or the grammar issues section, not the entire panel. Static elements like the tone label and stats can update silently.

Environment

• Browser: Chrome / Firefox
• OS: Any
• MindTab version: 1.2.0
• Grammar server in use: Yes / No (affects grammar section)

Module(s) affected

• Writing Assistant

Console errors

None.

Additional context

Fix: remove aria-live="polite" from #mt-panel in mtBuildPanel() in content_scripts/toneTranslator.js and add aria-live="polite" and aria-atomic="false" to #mt-suggestions only.