- 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.
- Added Photopea theme implementation report and design specifications.
- Created tool options and settings panels to match Photopea's layout.
- Implemented settings persistence to save and load user preferences.
- Updated toolbar to include SVG icons and tool options in a single row.
- Enhanced tool settings with specific parameters for each tool type.
- Added functionality for resetting tool settings to defaults.
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