Completed quick edit handler abstraction refactoring. **Changes Made:** 1. Created `/Users/joe/gitea/trckr/tui/quick_edit.py` (220 lines): - QuickEditHandler class that encapsulates common quick edit pattern - Three handler methods for different field types: * `handle_single_field()` - for required fields (status, priority) * `handle_nullable_field()` - for optional fields (milestone_id, owner) * `handle_list_field()` - for list fields (labels, tags) 2. Refactored 7 quick edit callbacks in `tui/app.py`: - `_on_quick_edit_status` (lines 1350-1360) - `_on_quick_edit_priority` (lines 1362-1372) - `_on_quick_edit_milestone` (lines 1374-1393) - `_on_quick_edit_labels` (lines 1395-1406) - `_on_quick_edit_project_status` (lines 1408-1418) - `_on_quick_edit_project_owner` (lines 1420-1431) - `_on_quick_edit_project_tags` (lines 1458-1469) **Pattern Encapsulated:** 1. Check for None result (user cancelled) 2. Find item in store by ID 3. Update field and updated_at timestamp 4. Save store 5. Refresh table 6. Restore cursor position 7. Show notification **Results:** - Reduced app.py from 1892 to 1828 lines (-64 lines) - All 832 tests pass ✓ - Commit: 7d2a92e - Remaining callbacks (_on_quick_edit_project_repos) can follow same pattern **Testing:** Verified all quick edit operations work correctly via test suite, including: - Issue status/priority/milestone/labels editing - Project status/owner/tags editing - Cursor position restoration - Proper notification messages