- Add `selection/state.rs` to manage selection masks, including combining masks and calculating bounds.
- Introduce `vector_edit.rs` for vector shape manipulation, handling drag sessions, and hit testing for handles.
- Create `feature_scorecard.rs` to ensure stable feature identifiers and regression gates for GUI components.
- Implement raster behavior tests in `raster_test.rs` to validate gradient application against masks.
- Removed obsolete plans for stroke tuning, commit regression gate, and wxPlainSlider port.
- Updated scrollable panel functionality to include optional scrollbar visibility.
- Enhanced brush panel to filter brush styles by category for improved user experience.
- Adjusted canvas rendering logic to prevent UI freezes during active drawing.
- Modified stroke brush logic to allow single dab drawing at the current position when no movement occurs.
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