upgrade packages + improve typing

webclient/src/setupTests.ts

@@ -1,2 +1,9 @@
 // ensure jest-dom is always available during testing to cut down on boilerplate
 import '@testing-library/jest-dom/vitest';
+
+// With isolate: false, all test files share the same module context.
+// Restore all mocks/spies after each test to prevent leakage between tests.
+afterEach(() => {
+  vi.restoreAllMocks();
+  vi.useRealTimers();
+});