Replaces all uses of alert() with showErrorNotification or showSuccessNotification for improved user experience and consistency. Refactors canvas creation to use the createCanvas utility function across multiple files, reducing code duplication and improving maintainability. Also updates layer ID generation to use generateUUID.
Moved convertToImage, createMaskFromImageSrc, and canvasToMaskImage from MaskProcessingUtils and mask_utils to ImageUtils for better modularity and reuse. Updated imports in dependent modules to use the new locations. Removed duplicate implementations from mask_utils and MaskProcessingUtils.
Extracted image upload, mask processing, notification, and preview update logic into dedicated utility modules. Updated MaskEditorIntegration and SAMDetectorIntegration to use these new utilities, reducing code duplication and improving maintainability.
Renamed the CanvasMask class and file to MaskEditorIntegration for improved clarity and consistency. Updated all references in Canvas and SAMDetectorIntegration to use the new name.
