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/tinyrainbow/dist/browser.d.ts

@@ -0,0 +1,8 @@
+import { C as Colors } from './index-8b61d5bc.js';
+export { F as Formatter, g as getDefaultColors } from './index-8b61d5bc.js';
+
+declare function isSupported(): boolean;
+declare function createColors(): Colors;
+declare const _default: Colors;
+
+export { Colors, createColors, _default as default, isSupported };