- Add favorite model selection to QuickEntryBox and InlineCreateCard components
- Wire up model favorites in TaskForm and TaskDetailModal
- Add model favorites management UI to SettingsModal
- Add tests for favorites in InlineCreateCard, QuickEntryBox, TaskForm, ListView, and SettingsModal
- Remove unused CommitDiffTab component and related tests
- Extract shared TaskForm component from NewTaskModal with all form fields and validation logic
- Integrate TaskForm into NewTaskModal, replacing duplicated form code
- Integrate TaskForm into TaskDetailModal edit mode for consistent editing experience
- Add comprehensive tests for TaskForm, Header, and updated modal components
- Clean up removed/obsolete tests and fix SSE, settings, and comment components
