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/scrollLeft.js

@@ -0,0 +1,9 @@
+import getScrollAccessor from './getScrollAccessor';
+/**
+ * Gets or sets the scroll left position of a given element.
+ * 
+ * @param node the element
+ * @param val the position to set
+ */
+
+export default getScrollAccessor('pageXOffset');