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/vitest/dist/suite.d.ts

@@ -0,0 +1,5 @@
+export { g as getBenchFn, a as getBenchOptions } from './chunks/suite.d.FvehnV49.js';
+export { VitestRunner, VitestRunnerConfig, createTaskCollector, getCurrentSuite, getCurrentTest, getFn, getHooks, setFn, setHooks } from '@vitest/runner';
+export { createChainable } from '@vitest/runner/utils';
+import './chunks/benchmark.d.BwvBVTda.js';
+import 'tinybench';