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/tinypool/dist/entry/utils.d.ts

@@ -0,0 +1,7 @@
+//#region src/entry/utils.d.ts
+type Handler = Function;
+declare function getHandler(filename: string, name: string): Promise<Handler | null>;
+declare function throwInNextTick(error: Error): void;
+
+//#endregion
+export { getHandler, throwInNextTick };