Add content policy checks and rate limiting

lib/utils.ts

@@ -7,3 +7,17 @@ export function cn(...inputs: ClassValue[]) {
 
 export const TOGETHER_LINK =
   "https://togetherai.link/?utm_source=make-comics&utm_medium=referral&utm_campaign=example-app";
+
+export function isContentPolicyViolation(errorMessage: string): boolean {
+  return (
+    errorMessage.includes("content policy") ||
+    errorMessage.includes("Invalid content detected") ||
+    errorMessage.includes("content moderation") ||
+    errorMessage.includes("flagged and rejected") ||
+    errorMessage.includes("NO_IMAGE")
+  );
+}
+
+export function getContentPolicyErrorMessage(): string {
+  return "Unable to generate image due to content policy. Please try a different prompt.";
+}