Extracted and centralized common utility functions such as createCanvas, normalizeToUint8, and generateUniqueFileName in CommonUtils.js to reduce code duplication. Added createImageFromSource to ImageUtils.js. Refactored db.js to use a helper for IndexedDB requests, simplifying error handling and reducing boilerplate. Updated CanvasIO.js, CanvasLayers.js, and Canvas_view.js to use the new utilities.
Moved all input/output related methods from Canvas.js to a new CanvasIO.js module and delegated corresponding Canvas class methods to CanvasIO. This improves code organization and separation of concerns, making Canvas.js more focused on core canvas logic and CanvasIO.js responsible for I/O operations.