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/@babel/runtime/helpers/assertThisInitialized.js

@@ -0,0 +1,5 @@
+function _assertThisInitialized(e) {
+  if (void 0 === e) throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
+  return e;
+}
+module.exports = _assertThisInitialized, module.exports.__esModule = true, module.exports["default"] = module.exports;