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/monthsToQuarters.mjs

@@ -0,0 +1,31 @@
+import { monthsInQuarter } from "./constants.mjs";
+
+/**
+ * @name monthsToQuarters
+ * @category Conversion Helpers
+ * @summary Convert number of months to quarters.
+ *
+ * @description
+ * Convert a number of months to a full number of quarters.
+ *
+ * @param months - The number of months to be converted.
+ *
+ * @returns The number of months converted in quarters
+ *
+ * @example
+ * // Convert 6 months to quarters:
+ * const result = monthsToQuarters(6)
+ * //=> 2
+ *
+ * @example
+ * // It uses floor rounding:
+ * const result = monthsToQuarters(7)
+ * //=> 2
+ */
+export function monthsToQuarters(months) {
+  const quarters = months / monthsInQuarter;
+  return Math.trunc(quarters);
+}
+
+// Fallback for modularized imports:
+export default monthsToQuarters;