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/use-sidecar/dist/es2015/index.d.ts

@@ -0,0 +1,7 @@
+export { sidecar } from './hoc';
+export { useSidecar } from './hook';
+export { setConfig } from './config';
+export { createMedium, createSidecarMedium } from './medium';
+export { renderCar } from './renderProp';
+export { exportSidecar } from './exports';
+export type { SideCarComponent } from './types';