feat: enhance AI image generation and prompt handling in canvas components

- Introduced shimmer animation for loading states in AI image nodes.
- Updated prompt node to handle image generation with improved error handling and user feedback.
- Refactored AI image node to manage generation status and display loading indicators.
- Enhanced data handling in canvas components to include canvasId for better context management.
- Improved status message handling in Convex mutations for clearer user feedback.

components/canvas/canvas.tsx

@@ -192,7 +192,7 @@ function CanvasInner({ canvasId }: CanvasInnerProps) {
         positionY: position.y,
         width: defaults.width,
         height: defaults.height,
-        data: defaults.data,
+        data: { ...defaults.data, canvasId },
       });
     },
     [screenToFlowPosition, createNode, canvasId],