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/scrollTop.d.ts

@@ -0,0 +1,11 @@
+declare const _default: {
+    (node: Element): number;
+    (node: Element, val: number): undefined;
+};
+/**
+ * Gets or sets the scroll top position of a given element.
+ *
+ * @param node the element
+ * @param val the position to set
+ */
+export default _default;