feat(bd-2ar): Add blessed TUI tests for app.ts main TUI class
Comprehensive test coverage for FabricTuiApp including:
- Constructor with default and custom options
- createTuiApp factory function
- All key bindings (q, C-c, ?, tab, S-tab, r, C-k, enter, H, D, escape)
- start/stop lifecycle methods
- addEvent and render methods
- View mode switching (default, heatmap, DAG)
- Help overlay toggle
- Command palette toggle
- Tab navigation
- Worker detail view
- Edge cases (empty store, multiple starts, events before start)
All components are mocked using class syntax for proper constructor mocking.
Process.exit is mocked to prevent test termination.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude Worker <noreply@anthropic.com>
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