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/cssstyle/lib/properties/paddingTop.js

@@ -0,0 +1,13 @@
+'use strict';
+
+var padding = require('./padding.js');
+var parsers = require('../parsers.js');
+
+module.exports.definition = {
+  set: parsers.subImplicitSetter('padding', 'top', padding.isValid, padding.parser),
+  get: function() {
+    return this.getPropertyValue('padding-top');
+  },
+  enumerable: true,
+  configurable: true,
+};