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/PluginsHandler.d.ts

@@ -0,0 +1,8 @@
+import { EmblaCarouselType } from './EmblaCarousel';
+import { OptionsHandlerType } from './OptionsHandler';
+import { EmblaPluginsType, EmblaPluginType } from './Plugins';
+export type PluginsHandlerType = {
+    init: (emblaApi: EmblaCarouselType, plugins: EmblaPluginType[]) => EmblaPluginsType;
+    destroy: () => void;
+};
+export declare function PluginsHandler(optionsHandler: OptionsHandlerType): PluginsHandlerType;