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/recharts/es6/util/IfOverflowMatches.js

@@ -0,0 +1,8 @@
+export var ifOverflowMatches = function ifOverflowMatches(props, value) {
+  var alwaysShow = props.alwaysShow;
+  var ifOverflow = props.ifOverflow;
+  if (alwaysShow) {
+    ifOverflow = 'extendDomain';
+  }
+  return ifOverflow === value;
+};