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/secondsToMinutes.d.ts

@@ -0,0 +1,23 @@
+/**
+ * @name secondsToMinutes
+ * @category Conversion Helpers
+ * @summary Convert seconds to minutes.
+ *
+ * @description
+ * Convert a number of seconds to a full number of minutes.
+ *
+ * @param seconds - The number of seconds to be converted
+ *
+ * @returns The number of seconds converted in minutes
+ *
+ * @example
+ * // Convert 120 seconds into minutes
+ * const result = secondsToMinutes(120)
+ * //=> 2
+ *
+ * @example
+ * // It uses floor rounding:
+ * const result = secondsToMinutes(119)
+ * //=> 1
+ */
+export declare function secondsToMinutes(seconds: number): number;