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/differenceInSeconds.mjs

@@ -0,0 +1,39 @@
+import { getRoundingMethod } from "./_lib/getRoundingMethod.mjs";
+import { differenceInMilliseconds } from "./differenceInMilliseconds.mjs";
+
+/**
+ * The {@link differenceInSeconds} function options.
+ */
+
+/**
+ * @name differenceInSeconds
+ * @category Second Helpers
+ * @summary Get the number of seconds between the given dates.
+ *
+ * @description
+ * Get the number of seconds between the given dates.
+ *
+ * @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 dateLeft - The later date
+ * @param dateRight - The earlier date
+ * @param options - An object with options.
+ *
+ * @returns The number of seconds
+ *
+ * @example
+ * // How many seconds are between
+ * // 2 July 2014 12:30:07.999 and 2 July 2014 12:30:20.000?
+ * const result = differenceInSeconds(
+ *   new Date(2014, 6, 2, 12, 30, 20, 0),
+ *   new Date(2014, 6, 2, 12, 30, 7, 999)
+ * )
+ * //=> 12
+ */
+export function differenceInSeconds(dateLeft, dateRight, options) {
+  const diff = differenceInMilliseconds(dateLeft, dateRight) / 1000;
+  return getRoundingMethod(options?.roundingMethod)(diff);
+}
+
+// Fallback for modularized imports:
+export default differenceInSeconds;