feat: enhance canvas and node components with error handling and retry logic

- Integrated retry logic for AI image generation to handle transient errors and improve user experience.
- Updated error categorization to provide more informative feedback based on different failure scenarios.
- Enhanced node components to display retry attempts and error messages, improving visibility during image generation failures.
- Refactored canvas and node components to include retry count in status updates, ensuring accurate tracking of generation attempts.

lib/canvas-utils.ts

@@ -17,6 +17,7 @@ export function convexNodeToRF(node: Doc<"nodes">): RFNode {
       // Status direkt in data durchreichen, damit Node-Komponenten darauf zugreifen können
       _status: node.status,
       _statusMessage: node.statusMessage,
+      retryCount: node.retryCount,
     },
     parentId: node.parentId ?? undefined,
     zIndex: node.zIndex,