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/cac/deno/deno.ts

@@ -0,0 +1,4 @@
+// Ignore the TypeScript errors
+// Since this file will only be used in Deno runtime
+export const processArgs = ['deno', 'cli'].concat(Deno.args);
+export const platformInfo = `${Deno.build.os}-${Deno.build.arch} deno-${Deno.version.deno}`;