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/millisecondsToHours.js

@@ -0,0 +1,30 @@
+"use strict";
+exports.millisecondsToHours = millisecondsToHours;
+var _index = require("./constants.js");
+
+/**
+ * @name millisecondsToHours
+ * @category Conversion Helpers
+ * @summary Convert milliseconds to hours.
+ *
+ * @description
+ * Convert a number of milliseconds to a full number of hours.
+ *
+ * @param milliseconds - The number of milliseconds to be converted
+ *
+ * @returns The number of milliseconds converted in hours
+ *
+ * @example
+ * // Convert 7200000 milliseconds to hours:
+ * const result = millisecondsToHours(7200000)
+ * //=> 2
+ *
+ * @example
+ * // It uses floor rounding:
+ * const result = millisecondsToHours(7199999)
+ * //=> 1
+ */
+function millisecondsToHours(milliseconds) {
+  const hours = milliseconds / _index.millisecondsInHour;
+  return Math.trunc(hours);
+}