Refactors all custom CSS class names to include an 'lf-' prefix
(e.g. .painter-button -> .lf-painter-button, .clipboard-switch -> .lf-clipboard-switch).
This isolates LayerForge styles within the ComfyUI DOM and prevents
CSS namespace collisions with other custom nodes or host page styles.
Changes span src/ TypeScript source files and src/css/ stylesheets.
Moved all blend mode menu styles from CanvasLayers.ts to a dedicated CSS file. Replaced inline styles with CSS classes and preserved all functionality.
Dariusz L