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/embla-carousel/esm/components/ScrollProgress.d.ts

@@ -0,0 +1,5 @@
+import { LimitType } from './Limit.js';
+export type ScrollProgressType = {
+    get: (n: number) => number;
+};
+export declare function ScrollProgress(limit: LimitType): ScrollProgressType;