feat: redesign Exams List page to show submitted custom exams

- Added Custom Exams tab showing all exams from Generation page
- Displays title, module badges, duration, and status
- Added Create Exam button
- Kept Exam Sessions tab for institutional sessions
- Search filters across exams

Made-with: Cursor

node_modules/@radix-ui/react-use-effect-event/dist/index.d.ts

@@ -0,0 +1,8 @@
+type AnyFunction = (...args: any[]) => any;
+/**
+ * Designed to approximate the behavior on `experimental_useEffectEvent` as best
+ * as possible until its stable release, and back-fill it as a shim as needed.
+ */
+declare function useEffectEvent<T extends AnyFunction>(callback?: T): T;
+
+export { useEffectEvent };