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/locale/gl.d.ts

@@ -0,0 +1,10 @@
+import type { Locale } from "./types.js";
+/**
+ * @category Locales
+ * @summary Galician locale.
+ * @language Galician
+ * @iso-639-2 glg
+ * @author Alberto Doval - Cocodin Technology[@cocodinTech](https://github.com/cocodinTech)
+ * @author Fidel Pita [@fidelpita](https://github.com/fidelpita)
+ */
+export declare const gl: Locale;