Implemented logic in Canvas.js to save and restore mask state when the mask editor is cancelled. Added robust detection and event listener setup for the cancel button in mask_utils.js, including multiple selector strategies and fallback mechanisms. This improves user experience by allowing users to revert changes if they cancel out of the mask editor.
Introduces functionality for automatically applying predefined masks in the ComfyUI mask editor. Adds new API methods and utilities in Canvas.js and mask_utils.js, including support for sending a clean image, handling both new and old mask editors, and flexible mask formats. Includes documentation, usage examples, and helper functions for mask processing and error handling.
Introduces the ability to open the current canvas in a mask editor, upload and retrieve mask edits, and apply them to the mask layer. Adds utility functions for mask editor state detection and control, a new 'Edit Mask' button in the UI, and methods for handling mask updates and preview refresh. Also adds a setMask method to MaskTool for precise mask placement.
