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.
Replaced manual logger setup in CanvasRenderer, ImageCache, Mask_tool, and db modules with the createModuleLogger utility for cleaner and more consistent logging initialization.
Moved all rendering-related methods from Canvas.js to a new CanvasRenderer.js module. Canvas now delegates rendering to CanvasRenderer, improving separation of concerns and maintainability.
