Removed redundant comments and streamlined logic across canvas-related modules, including mask positioning, garbage collection, and WebSocket communication. Improved code readability and maintainability by eliminating unnecessary explanations and clarifying intent in both Python and JavaScript files. No functional changes were made; this is a cleanup and refactor for better developer experience.
Introduces an operation counter and threshold in ImageReferenceManager to trigger automatic garbage collection after a set number of canvas operations. Canvas now increments the operation count on save, undo, and redo, and exposes methods to set the operation threshold and retrieve stats including operation count. CanvasView displays the operation count and threshold after manual garbage collection.
Introduced ImageReferenceManager to track and clean up unused images from the database and cache. Added manual garbage collection controls to the UI and exposed related stats and cleanup methods in Canvas. Updated db.js with a method to retrieve all image IDs for cleanup purposes.
