fixed frontent test errors

frontend/vue-app/src/test/setup.ts

@@ -3,13 +3,6 @@ import { vi } from 'vitest'
 // jsdom does not implement scrollTo — stub it to suppress "Not implemented" warnings
 window.scrollTo = vi.fn()
 
-// jsdom does not support navigation — stub window.location to suppress
-// "Not implemented: navigation to another Document" warnings
-Object.defineProperty(window, 'location', {
-  value: { href: '', pathname: '/', assign: vi.fn(), replace: vi.fn(), reload: vi.fn() },
-  writable: true,
-})
-
 // Globally mock imageCache so component tests don't make real fetch calls
 // and don't spam "response.blob is not a function" errors in jsdom.
 vi.mock('@/common/imageCache', () => ({