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/secondsToHours.js

@@ -0,0 +1,30 @@
+"use strict";
+exports.secondsToHours = secondsToHours;
+var _index = require("./constants.js");
+
+/**
+ * @name secondsToHours
+ * @category Conversion Helpers
+ * @summary Convert seconds to hours.
+ *
+ * @description
+ * Convert a number of seconds to a full number of hours.
+ *
+ * @param seconds - The number of seconds to be converted
+ *
+ * @returns The number of seconds converted in hours
+ *
+ * @example
+ * // Convert 7200 seconds into hours
+ * const result = secondsToHours(7200)
+ * //=> 2
+ *
+ * @example
+ * // It uses floor rounding:
+ * const result = secondsToHours(7199)
+ * //=> 1
+ */
+function secondsToHours(seconds) {
+  const hours = seconds / _index.secondsInHour;
+  return Math.trunc(hours);
+}