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/reusify/eslint.config.js

@@ -0,0 +1,14 @@
+'use strict'
+
+const base = require('neostandard')({})
+
+module.exports = [
+  ...base,
+  {
+    name: 'old-standard',
+    rules: {
+      'no-var': 'off',
+      'object-shorthand': 'off',
+    }
+  }
+]