- Added marching_ants_offset to HcieIcedApp for animation state
- Added selection_bounds field to IcedDocument for persistent selection display
- Updated OverlayProgram to draw animated marching ants (black + white dashed lines)
- Added timer subscription for continuous animation when selection is active
- Updated SelectAll/Deselect handlers to properly manage selection state
- Selection now remains visible after creation with animated border
- 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.
- Changed default VISION_BACKEND from CPU to GPU for better performance.
- Made `map_brush_style` public to allow external access.
- Updated `Engine` struct to use pooled buffers for stroke snapshots, reducing memory allocations during brush strokes.
- Introduced `CompositeSnapshot` for efficient background compositing without blocking the UI thread.
- Implemented `SendPtr` for safe raw pointer handling across threads.
- Enhanced `commit_pending_history` to recycle buffers and improve performance.
- Fixed cursor preview issues for procedural brushes by removing unnecessary preset synchronization.
- Added tests and documentation for new features and performance improvements.
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