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-layout-effect/dist/index.d.ts

@@ -0,0 +1,12 @@
+import * as React from 'react';
+
+/**
+ * On the server, React emits a warning when calling `useLayoutEffect`.
+ * This is because neither `useLayoutEffect` nor `useEffect` run on the server.
+ * We use this safe version which suppresses the warning by replacing it with a noop on the server.
+ *
+ * See: https://reactjs.org/docs/hooks-reference.html#uselayouteffect
+ */
+declare const useLayoutEffect: typeof React.useLayoutEffect;
+
+export { useLayoutEffect };