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/loupe/lib/symbol.js

@@ -0,0 +1,6 @@
+export default function inspectSymbol(value) {
+    if ('description' in Symbol.prototype) {
+        return value.description ? `Symbol(${value.description})` : 'Symbol()';
+    }
+    return value.toString();
+}