Implements Task 5 of the TDD plan: creates the tray package with
AppState enum (WAITING, RECORDING, TRANSCRIBING) and a create_icon()
function that generates colorized microphone icons via Pillow.
- whisper_local/tray/__init__.py: empty package marker
- whisper_local/tray/_tray.py: AppState enum
- whisper_local/tray/_icon.py: icon generation with state-specific colors
- tests/test_tray.py: comprehensive test coverage for icon creation
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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