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/lodash/fp/range.js

@@ -0,0 +1,5 @@
+var convert = require('./convert'),
+    func = convert('range', require('../range'));
+
+func.placeholder = require('./placeholder');
+module.exports = func;