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-compose-refs/dist/index.d.ts

@@ -0,0 +1,15 @@
+import * as React from 'react';
+
+type PossibleRef<T> = React.Ref<T> | undefined;
+/**
+ * A utility to compose multiple refs together
+ * Accepts callback refs and RefObject(s)
+ */
+declare function composeRefs<T>(...refs: PossibleRef<T>[]): React.RefCallback<T>;
+/**
+ * A custom hook that composes multiple refs
+ * Accepts callback refs and RefObject(s)
+ */
+declare function useComposedRefs<T>(...refs: PossibleRef<T>[]): React.RefCallback<T>;
+
+export { composeRefs, useComposedRefs };