fix(codex-link): isolate model transfers and widen local connection capacity

apps/desktop/src/app/settings/codex-link-settings.test.tsx

@@ -139,6 +139,13 @@ describe('Codex Link settings', () => {
     expect(screen.getByRole('switch', { name: 'Codex Bağlama' }).getAttribute('aria-checked')).toBe('false')
   })
 
+  it('does not claim original settings were restored when disconnect failed', async () => {
+    get.mockResolvedValue({ ...RUNNING, enabled: false, lastError: 'config-write-failed' })
+    renderPage()
+    expect(await screen.findByText('Codex ayar dosyası yazılamadı.')).toBeTruthy()
+    expect(screen.queryByText('Codex Bağlama kapalı. Codex kendi ayarlarıyla çalışıyor.')).toBeNull()
+  })
+
   it('rolls the switch back and reports when the change fails', async () => {
     get.mockResolvedValue(RUNNING)
     set.mockRejectedValue(new Error('codex-link:unavailable'))