Moved CommonUtils.js, ImageUtils.js, and LoggerUtils.js to a new utils/ directory and updated all import paths accordingly throughout the codebase. Also increased the default canvas width in Canvas.js from 512 to 1024.
Refactors CanvasState to maintain independent undo/redo stacks for mask editing and layer editing. Updates all relevant logic to use the correct history depending on the active mode, ensuring undo/redo and history buttons work as expected in both modes. MaskTool now saves history on activation, clear, and mouse up, and history info is reported per mode. Improves user experience when switching between mask and layer editing.
Enhanced the canvas save mechanism to ensure unique file names per node, prevent concurrent saves and executions, and handle missing files more robustly. Switched all logger levels to DEBUG for detailed tracing. Added fallback logic for file naming, improved error handling, and ensured that empty canvases are not saved. These changes improve reliability and traceability of canvas operations, especially in multi-node scenarios.
Moved undo/redo history and IndexedDB state logic from Canvas.js to a new CanvasState.js module. Canvas now delegates state persistence and history operations to CanvasState, improving separation of concerns and maintainability.
