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/dunder-proto/test/index.js

@@ -0,0 +1,4 @@
+'use strict';
+
+require('./get');
+require('./set');