fix: resolve all TypeScript errors in web app

apps/web/src/lib/api/client.test.ts

@@ -141,7 +141,7 @@ describe("API Client", () => {
       );
 
       // Verify body is not in the call
-      const callArgs = mockFetch.mock.calls[0][1] as RequestInit;
+      const callArgs = mockFetch.mock.calls[0]![1] as RequestInit;
       expect(callArgs.body).toBeUndefined();
     });
   });