Desktop: wire release toast Update to updater (#7549)

Desktop builds should not send users to git-update docs from the release
notification toast; route the toast “Update” action into the Desktop
updater flow.

On Electron, the release toast “Update” button executes
`Comfy-Desktop.CheckForUpdates`; failures surface via
`useErrorHandling`.

Fixes #7543

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7549-Desktop-wire-release-toast-Update-to-updater-2cb6d73d3650815aadbccc15c724815d)
by [Unito](https://www.unito.io)

src/platform/updates/components/ReleaseNotificationToast.test.ts

@@ -5,6 +5,14 @@ import { beforeEach, describe, expect, it, vi } from 'vitest'
 import type { ReleaseNote } from '../common/releaseService'
 import ReleaseNotificationToast from './ReleaseNotificationToast.vue'
 
+const { commandExecuteMock } = vi.hoisted(() => ({
+  commandExecuteMock: vi.fn()
+}))
+
+const { toastErrorHandlerMock } = vi.hoisted(() => ({
+  toastErrorHandlerMock: vi.fn()
+}))
+
 // Mock dependencies
 vi.mock('vue-i18n', () => ({
   useI18n: vi.fn(() => ({
@@ -36,6 +44,18 @@ vi.mock('@/utils/markdownRendererUtil', () => ({
   renderMarkdownToHtml: vi.fn((content: string) => `<div>${content}</div>`)
 }))
 
+vi.mock('@/composables/useErrorHandling', () => ({
+  useErrorHandling: vi.fn(() => ({
+    toastErrorHandler: toastErrorHandlerMock
+  }))
+}))
+
+vi.mock('@/stores/commandStore', () => ({
+  useCommandStore: vi.fn(() => ({
+    execute: commandExecuteMock
+  }))
+}))
+
 // Mock release store
 const mockReleaseStore = {
   recentRelease: null as ReleaseNote | null,
@@ -159,6 +179,58 @@ describe('ReleaseNotificationToast', () => {
     )
   })
 
+  it('executes desktop updater flow when running in Electron', async () => {
+    mockReleaseStore.recentRelease = {
+      version: '1.2.3',
+      content: '# Test Release'
+    } as ReleaseNote
+
+    commandExecuteMock.mockResolvedValueOnce(undefined)
+
+    const mockWindowOpen = vi.fn()
+    Object.defineProperty(window, 'open', {
+      value: mockWindowOpen,
+      writable: true
+    })
+    ;(window as any).electronAPI = {}
+
+    wrapper = mountComponent()
+    await wrapper.vm.handleUpdate()
+
+    expect(commandExecuteMock).toHaveBeenCalledWith(
+      'Comfy-Desktop.CheckForUpdates'
+    )
+    expect(mockWindowOpen).not.toHaveBeenCalled()
+    expect(toastErrorHandlerMock).not.toHaveBeenCalled()
+
+    delete (window as any).electronAPI
+  })
+
+  it('shows an error toast if the desktop updater flow fails in Electron', async () => {
+    mockReleaseStore.recentRelease = {
+      version: '1.2.3',
+      content: '# Test Release'
+    } as ReleaseNote
+
+    const error = new Error('Command Comfy-Desktop.CheckForUpdates not found')
+    commandExecuteMock.mockRejectedValueOnce(error)
+
+    const mockWindowOpen = vi.fn()
+    Object.defineProperty(window, 'open', {
+      value: mockWindowOpen,
+      writable: true
+    })
+    ;(window as any).electronAPI = {}
+
+    wrapper = mountComponent()
+    await wrapper.vm.handleUpdate()
+
+    expect(toastErrorHandlerMock).toHaveBeenCalledWith(error)
+    expect(mockWindowOpen).not.toHaveBeenCalled()
+
+    delete (window as any).electronAPI
+  })
+
   it('calls handleShowChangelog when learn more link is clicked', async () => {
     mockReleaseStore.recentRelease = {
       version: '1.2.3',