Enhanced the canvas save mechanism to ensure unique file names per node, prevent concurrent saves and executions, and handle missing files more robustly. Switched all logger levels to DEBUG for detailed tracing. Added fallback logic for file naming, improved error handling, and ensured that empty canvases are not saved. These changes improve reliability and traceability of canvas operations, especially in multi-node scenarios.
Moved all layer-related logic from Canvas.js to a new CanvasLayers.js module, including blend modes, clipboard operations, transformations, and utility functions. Canvas.js now delegates these operations to CanvasLayers, improving code organization and maintainability.
