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/fromUnixTime.d.ts

@@ -0,0 +1,18 @@
+/**
+ * @name fromUnixTime
+ * @category Timestamp Helpers
+ * @summary Create a date from a Unix timestamp.
+ *
+ * @description
+ * Create a date from a Unix timestamp (in seconds). Decimal values will be discarded.
+ *
+ * @param unixTime - The given Unix timestamp (in seconds)
+ *
+ * @returns The date
+ *
+ * @example
+ * // Create the date 29 February 2012 11:45:05:
+ * const result = fromUnixTime(1330515905)
+ * //=> Wed Feb 29 2012 11:45:05
+ */
+export declare function fromUnixTime(unixTime: number): Date;