feat: implement quiz generation service with topic selection, LLM integration, and question bank management

src/lib/llmSchemas.js

@@ -115,7 +115,7 @@ export const learningAllSchema = z.object({
 const quizDifficultyEnum = z.enum(['easy', 'medium', 'hard']).catch('medium');
 
 const quizQuestionSchema = z.object({
-  id: z.string().min(1).catch(`gen-${Math.random().toString(36).slice(2, 8)}`),
+  id: z.string().min(1).catch(() => `gen-${Math.random().toString(36).slice(2, 8)}`),
   question: z.string().min(1),
   topicLabel: z.string().min(1).catch('General'),
   options: z.array(z.string().min(1)).length(4),