test: fix flaky per-service toggle assertion in SettingsModal

The toggle label renders before settingsApi.get() resolves, so reading
.checked immediately raced the async state update and failed on slower CI.
Wait for the resolved checked state instead.

ha-relevant: no

frontend/src/components/modals/__tests__/SettingsModal.test.tsx

@@ -80,7 +80,9 @@ describe('SettingsModal', () => {
     vi.mocked(settingsApi.get).mockResolvedValue({ data: { interval_seconds: 60, service_check_enabled: true, service_check_interval: 600 } } as never)
     render(<SettingsModal open onClose={vi.fn()} />)
     const toggle = await screen.findByLabelText('Toggle per-service status checks') as HTMLInputElement
-    expect(toggle.checked).toBe(true)
+    // The toggle label renders immediately; its checked state only flips once
+    // settingsApi.get() resolves, so wait for that before asserting.
+    await waitFor(() => expect(toggle.checked).toBe(true))
     expect(await screen.findByDisplayValue('600')).toBeDefined()
 
     fireEvent.click(toggle) // disable