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/@testing-library/jest-dom/dist/jest-globals.mjs

@@ -0,0 +1,13 @@
+import { expect } from '@jest/globals';
+import { e as extensions } from './matchers-35e4d3bd.mjs';
+import 'redent';
+import '@adobe/css-tools';
+import 'dom-accessibility-api';
+import 'aria-query';
+import 'picocolors';
+import 'css.escape';
+
+/* istanbul ignore file */
+
+
+expect.extend(extensions);