feat: switch frontend indexing to code-first identifiers

src/test/setup.ts

@@ -15,13 +15,15 @@ const localStorageMock = {
 vi.stubGlobal('localStorage', localStorageMock)
 
 // Mock window.location
-delete window.location
-window.location = Object.defineProperties({}, {
+Object.defineProperty(window, 'location', {
+  configurable: true,
+  value: Object.defineProperties({}, {
   pathname: { value: '/calendar', writable: true },
   href: { value: 'http://localhost/calendar', writable: true },
   assign: { value: vi.fn(), writable: true },
   replace: { value: vi.fn(), writable: true },
-}) as any
+  }) as any,
+})
 
 // Mock matchMedia
 Object.defineProperty(window, 'matchMedia', {