test: clear all mocks in beforeEach so hook tests are reorder-safe (#955)

Addresses copilot review feedback on PR #959: Router.push and other
module-level jest.fn() mocks weren't being cleared between tests, which
made assertions order-dependent.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: frano-m

tests/useNextAuthService.test.ts

@@ -31,6 +31,7 @@ const MOCK_LOGIN = service.login as jest.MockedFunction<typeof service.login>;
 
 describe("useNextAuthService", () => {
   beforeEach(() => {
+    jest.clearAllMocks();
     mockRouterQuery = {};
     MOCK_LOGIN.mockReset();
     MOCK_USE_ROUTE_HISTORY.mockReset();

tests/useSessionActive.test.ts

@@ -61,6 +61,7 @@ const MOCK_USE_ROUTE_HISTORY = useRouteHistory as jest.MockedFunction<
 
 describe("useSessionActive", () => {
   beforeEach(() => {
+    jest.clearAllMocks();
     mockRouterQuery = {};
     MOCK_USE_ROUTE_HISTORY.mockReset();
     MOCK_USE_ROUTE_HISTORY.mockReturnValue({