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/components/ScrollLooper.d.ts

@@ -0,0 +1,6 @@
+import { LimitType } from './Limit';
+import { Vector1DType } from './Vector1d';
+export type ScrollLooperType = {
+    loop: (direction: number) => void;
+};
+export declare function ScrollLooper(contentSize: number, limit: LimitType, location: Vector1DType, vectors: Vector1DType[]): ScrollLooperType;