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.

components/canvas/credit-display.tsx

@@ -3,7 +3,7 @@
 import { useMutation, useQuery } from "convex/react";
 import { api } from "@/convex/_generated/api";
 import { Coins } from "lucide-react";
-import { toast } from "sonner";
+import { toast } from "@/lib/toast";
 
 const TIER_LABELS: Record<string, string> = {
   free: "Free",