fix(frontend): preserve callback recovery state

frontend/src/views/auth/__tests__/LinuxDoCallbackView.spec.ts

@@ -409,6 +409,50 @@ describe('LinuxDoCallbackView', () => {
     })
   })
 
+  it('keeps the oauth flow active when complete-registration returns another pending step', async () => {
+    exchangePendingOAuthCompletion.mockResolvedValue({
+      error: 'invitation_required',
+      redirect: '/dashboard',
+      adoption_required: true,
+      suggested_display_name: 'LinuxDo Nick',
+      suggested_avatar_url: 'https://cdn.example/linuxdo.png'
+    })
+    completeLinuxDoOAuthRegistration.mockResolvedValue({
+      auth_result: 'pending_session',
+      step: 'choose_account_action_required',
+      redirect: '/dashboard',
+      email: 'fresh@example.com',
+      resolved_email: 'fresh@example.com',
+      force_email_on_signup: true,
+      adoption_required: true
+    })
+
+    const wrapper = mount(LinuxDoCallbackView, {
+      global: {
+        stubs: {
+          AuthLayout: { template: '<div><slot /></div>' },
+          Icon: true,
+          RouterLink: { template: '<a><slot /></a>' },
+          transition: false
+        }
+      }
+    })
+
+    await flushPromises()
+    await wrapper.find('input[type="text"]').setValue('invite-code')
+    await wrapper.find('button').trigger('click')
+    await flushPromises()
+
+    expect(completeLinuxDoOAuthRegistration).toHaveBeenCalledWith('invite-code', {
+      adoptDisplayName: true,
+      adoptAvatar: true
+    })
+    expect(setToken).not.toHaveBeenCalled()
+    expect(replace).not.toHaveBeenCalled()
+    expect(wrapper.text()).toContain('auth.oauthFlow.bindExistingAccount')
+    expect(wrapper.text()).toContain('auth.oauthFlow.createNewAccount')
+  })
+
   it('collects email, password, and verify code for pending oauth account creation and submits adoption decisions', async () => {
     getPublicSettings.mockResolvedValue({
       invitation_code_enabled: true,