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/dom-helpers/esm/width.js

@@ -0,0 +1,13 @@
+import getWindow from './isWindow';
+import offset from './offset';
+/**
+ * Returns the width of a given element.
+ * 
+ * @param node the element
+ * @param client whether to use `clientWidth` if possible
+ */
+
+export default function getWidth(node, client) {
+  var win = getWindow(node);
+  return win ? win.innerWidth : client ? node.clientWidth : offset(node).width;
+}