- Add `persistence.rs` for stable serialization of dock layouts without runtime identifiers.
- Introduce `preview.rs` for geometry handling of dock drop previews.
- Create `sizing.rs` to manage content-aware sizing policies and constraint solving for dock panels.
- Implement `welcome.rs` to provide a welcome surface when no documents are open, featuring New and Open actions.
- Introduced `theme.rs` to handle visual themes, font discovery, and application of theme colors.
- Implemented system font registration for Linux, macOS, and Windows.
- Added `apply_theme` function to configure egui visuals based on selected theme presets.
feat: Implement interactive tool state management
- Created `tool_state.rs` to manage runtime tool, selection, and transform states.
- Defined `ToolState` struct to encapsulate active tool, color settings, drawing states, and AI panel states.
- Included functionality for managing brush presets, text editing, and selection transformations.
feat: Add utility functions for image and file handling
- Developed `utils.rs` with stateless helper functions for color formatting, drawing icons, and cropping images.
- Implemented save dialog builders and error handling for file operations.
- Added flood fill functionality for composite RGBA pixels.
test: Add unit test for bitmap brush stamp functionality
- Created `bitmap_brush_stamp.rs` to verify the behavior of bitmap brush stamping in the engine.
- Ensured that the painted area matches expected dimensions and characteristics.
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