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/date-fns/fp/startOfMonth.mjs

@@ -0,0 +1,8 @@
+// This file is generated automatically by `scripts/build/fp.ts`. Please, don't change it.
+import { startOfMonth as fn } from "../startOfMonth.mjs";
+import { convertToFP } from "./_lib/convertToFP.mjs";
+
+export const startOfMonth = convertToFP(fn, 1);
+
+// Fallback for modularized imports:
+export default startOfMonth;