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/weeksToDays.d.mts

@@ -0,0 +1,18 @@
+/**
+ * @name weeksToDays
+ * @category Conversion Helpers
+ * @summary Convert weeks to days.
+ *
+ * @description
+ * Convert a number of weeks to a full number of days.
+ *
+ * @param weeks - The number of weeks to be converted
+ *
+ * @returns The number of weeks converted in days
+ *
+ * @example
+ * // Convert 2 weeks into days
+ * const result = weeksToDays(2)
+ * //=> 14
+ */
+export declare function weeksToDays(weeks: number): number;