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/endOfDecade.d.ts

@@ -0,0 +1,22 @@
+/**
+ * @name endOfDecade
+ * @category Decade Helpers
+ * @summary Return the end of a decade for the given date.
+ *
+ * @description
+ * Return the end of a decade for 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 original date
+ *
+ * @returns The end of a decade
+ *
+ * @example
+ * // The end of a decade for 12 May 1984 00:00:00:
+ * const result = endOfDecade(new Date(1984, 4, 12, 00, 00, 00))
+ * //=> Dec 31 1989 23:59:59.999
+ */
+export declare function endOfDecade<DateType extends Date>(
+  date: DateType | number | string,
+): DateType;