## Why
Meeting Assistant currently exposes recording controls through hotkeys and HTTP endpoints, but there is no persistent Windows taskbar/tray affordance showing what the assistant is doing.

## What Changes
- Add a Windows taskbar notification icon for Meeting Assistant.
- Show idle, recording, or summarizing/processing state through the icon and tooltip.
- Prioritize the newest active recording over older stopped runs that may still be summarizing.
- Add a right-click menu with state-aware recording controls:
  - start meeting recording per configured launch profile
  - stop active recording and continue transcription/summary
  - cancel active recording and discard artifacts
  - switch the active recording to another configured launch profile

## Impact
- Adds a small Windows-only hosted UI service.
- Extends recording status with state/profile information needed by the tray surface.
- Adds focused tests for tray state/menu behavior and launch profile enumeration.