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/use-sidecar/dist/es2015/config.d.ts

@@ -0,0 +1,5 @@
+export interface IConfig {
+    onError(e: Error): void;
+}
+export declare const config: IConfig;
+export declare const setConfig: (conf: Partial<IConfig>) => void;