- Add notification service with toast component for success/error/warning/info messages
- Add API status banner showing when backend is unavailable with retry button
- Add loading spinners to all async action buttons (start/stop/install/delete)
- Add mobile responsive drawer sidebar with hamburger menu
- Add responsive styles for workers table, profiles grid, and miners grid
- Add inline profile editing with save/cancel functionality
- Add unit tests for notification service, toast component, and sidebar (36 tests passing)
- Fix broken app.spec.ts test
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
