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/ScrollSnaps.d.ts

@@ -0,0 +1,9 @@
+import { AlignmentType } from './Alignment';
+import { AxisType } from './Axis';
+import { NodeRectType } from './NodeRects';
+import { SlidesToScrollType } from './SlidesToScroll';
+export type ScrollSnapsType = {
+    snaps: number[];
+    snapsAligned: number[];
+};
+export declare function ScrollSnaps(axis: AxisType, alignment: AlignmentType, containerRect: NodeRectType, slideRects: NodeRectType[], slidesToScroll: SlidesToScrollType): ScrollSnapsType;