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-direction/dist/index.d.mts

@@ -0,0 +1,12 @@
+import * as React from 'react';
+
+type Direction = 'ltr' | 'rtl';
+interface DirectionProviderProps {
+    children?: React.ReactNode;
+    dir: Direction;
+}
+declare const DirectionProvider: React.FC<DirectionProviderProps>;
+declare function useDirection(localDir?: Direction): Direction;
+declare const Provider: React.FC<DirectionProviderProps>;
+
+export { DirectionProvider, Provider, useDirection };