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/isBefore.d.ts

@@ -0,0 +1,24 @@
+/**
+ * @name isBefore
+ * @category Common Helpers
+ * @summary Is the first date before the second one?
+ *
+ * @description
+ * Is the first date before the second one?
+ *
+ * @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 date that should be before the other one to return true
+ * @param dateToCompare - The date to compare with
+ *
+ * @returns The first date is before the second date
+ *
+ * @example
+ * // Is 10 July 1989 before 11 February 1987?
+ * const result = isBefore(new Date(1989, 6, 10), new Date(1987, 1, 11))
+ * //=> false
+ */
+export declare function isBefore<DateType extends Date>(
+  date: DateType | number | string,
+  dateToCompare: DateType | number | string,
+): boolean;