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/date-fns/subMonths.mjs

@@ -0,0 +1,28 @@
+import { addMonths } from "./addMonths.mjs";
+
+/**
+ * @name subMonths
+ * @category Month Helpers
+ * @summary Subtract the specified number of months from the given date.
+ *
+ * @description
+ * Subtract the specified number of months from the given date.
+ *
+ * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
+ *
+ * @param date - The date to be changed
+ * @param amount - The amount of months to be subtracted.
+ *
+ * @returns The new date with the months subtracted
+ *
+ * @example
+ * // Subtract 5 months from 1 February 2015:
+ * const result = subMonths(new Date(2015, 1, 1), 5)
+ * //=> Mon Sep 01 2014 00:00:00
+ */
+export function subMonths(date, amount) {
+  return addMonths(date, -amount);
+}
+
+// Fallback for modularized imports:
+export default subMonths;