refactor: workspaces DDD (#8921)

## Summary

Refactor: workspaces related functionality into DDD structure.

Note: this is the 1st PR of 2 more refactoring.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8921-refactor-DDD-3096d73d3650812bb7f6eb955f042663)
by [Unito](https://www.unito.io)

src/platform/workspace/auth/WorkspaceAuthGate.test.ts

@@ -0,0 +1,206 @@
+import { flushPromises, mount } from '@vue/test-utils'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+import { ref } from 'vue'
+
+import WorkspaceAuthGate from './WorkspaceAuthGate.vue'
+
+const mockIsInitialized = ref(false)
+const mockCurrentUser = ref<object | null>(null)
+
+vi.mock('@/stores/firebaseAuthStore', () => ({
+  useFirebaseAuthStore: () => ({
+    isInitialized: mockIsInitialized,
+    currentUser: mockCurrentUser
+  })
+}))
+
+const mockRefreshRemoteConfig = vi.fn()
+vi.mock('@/platform/remoteConfig/refreshRemoteConfig', () => ({
+  refreshRemoteConfig: (options: unknown) => mockRefreshRemoteConfig(options)
+}))
+
+const mockTeamWorkspacesEnabled = vi.hoisted(() => ({ value: false }))
+vi.mock('@/composables/useFeatureFlags', () => ({
+  useFeatureFlags: () => ({
+    flags: {
+      get teamWorkspacesEnabled() {
+        return mockTeamWorkspacesEnabled.value
+      }
+    }
+  })
+}))
+
+const mockWorkspaceStoreInitialize = vi.fn()
+const mockWorkspaceStoreInitState = vi.hoisted(() => ({
+  value: 'uninitialized' as string
+}))
+vi.mock('@/platform/workspace/stores/teamWorkspaceStore', () => ({
+  useTeamWorkspaceStore: () => ({
+    get initState() {
+      return mockWorkspaceStoreInitState.value
+    },
+    initialize: mockWorkspaceStoreInitialize
+  })
+}))
+
+const mockIsCloud = vi.hoisted(() => ({ value: true }))
+vi.mock('@/platform/distribution/types', () => ({
+  get isCloud() {
+    return mockIsCloud.value
+  }
+}))
+
+vi.mock('primevue/progressspinner', () => ({
+  default: { template: '<div class="progress-spinner" />' }
+}))
+
+describe('WorkspaceAuthGate', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mockIsCloud.value = true
+    mockIsInitialized.value = false
+    mockCurrentUser.value = null
+    mockTeamWorkspacesEnabled.value = false
+    mockWorkspaceStoreInitState.value = 'uninitialized'
+    mockRefreshRemoteConfig.mockResolvedValue(undefined)
+    mockWorkspaceStoreInitialize.mockResolvedValue(undefined)
+  })
+
+  const mountComponent = () =>
+    mount(WorkspaceAuthGate, {
+      slots: {
+        default: '<div data-testid="slot-content">App Content</div>'
+      }
+    })
+
+  describe('non-cloud builds', () => {
+    it('renders slot immediately when isCloud is false', async () => {
+      mockIsCloud.value = false
+
+      const wrapper = mountComponent()
+      await flushPromises()
+
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+      expect(wrapper.find('.progress-spinner').exists()).toBe(false)
+      expect(mockRefreshRemoteConfig).not.toHaveBeenCalled()
+    })
+  })
+
+  describe('cloud builds - unauthenticated user', () => {
+    it('shows spinner while waiting for Firebase auth', () => {
+      mockIsInitialized.value = false
+
+      const wrapper = mountComponent()
+
+      expect(wrapper.find('.progress-spinner').exists()).toBe(true)
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(false)
+    })
+
+    it('renders slot when Firebase initializes with no user', async () => {
+      mockIsInitialized.value = false
+
+      const wrapper = mountComponent()
+      expect(wrapper.find('.progress-spinner').exists()).toBe(true)
+
+      mockIsInitialized.value = true
+      mockCurrentUser.value = null
+      await flushPromises()
+
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+      expect(mockRefreshRemoteConfig).not.toHaveBeenCalled()
+    })
+  })
+
+  describe('cloud builds - authenticated user', () => {
+    beforeEach(() => {
+      mockIsInitialized.value = true
+      mockCurrentUser.value = { uid: 'user-123' }
+    })
+
+    it('refreshes remote config with auth after Firebase init', async () => {
+      mountComponent()
+      await flushPromises()
+
+      expect(mockRefreshRemoteConfig).toHaveBeenCalledWith({ useAuth: true })
+    })
+
+    it('renders slot when teamWorkspacesEnabled is false', async () => {
+      mockTeamWorkspacesEnabled.value = false
+
+      const wrapper = mountComponent()
+      await flushPromises()
+
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+      expect(mockWorkspaceStoreInitialize).not.toHaveBeenCalled()
+    })
+
+    it('initializes workspace store when teamWorkspacesEnabled is true', async () => {
+      mockTeamWorkspacesEnabled.value = true
+
+      const wrapper = mountComponent()
+      await flushPromises()
+
+      expect(mockWorkspaceStoreInitialize).toHaveBeenCalled()
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+    })
+
+    it('skips workspace init when store is already initialized', async () => {
+      mockTeamWorkspacesEnabled.value = true
+      mockWorkspaceStoreInitState.value = 'ready'
+
+      const wrapper = mountComponent()
+      await flushPromises()
+
+      expect(mockWorkspaceStoreInitialize).not.toHaveBeenCalled()
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+    })
+  })
+
+  describe('error handling - graceful degradation', () => {
+    beforeEach(() => {
+      mockIsInitialized.value = true
+      mockCurrentUser.value = { uid: 'user-123' }
+    })
+
+    it('renders slot when remote config refresh fails', async () => {
+      mockRefreshRemoteConfig.mockRejectedValue(new Error('Network error'))
+
+      const wrapper = mountComponent()
+      await flushPromises()
+
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+    })
+
+    it('renders slot when remote config refresh times out', async () => {
+      vi.useFakeTimers()
+      // Never-resolving promise simulates a hanging request
+      mockRefreshRemoteConfig.mockReturnValue(new Promise(() => {}))
+
+      const wrapper = mountComponent()
+      await flushPromises()
+
+      // Still showing spinner before timeout
+      expect(wrapper.find('.progress-spinner').exists()).toBe(true)
+
+      // Advance past the 10 second timeout
+      await vi.advanceTimersByTimeAsync(10_001)
+      await flushPromises()
+
+      // Should render slot after timeout (graceful degradation)
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+      vi.useRealTimers()
+    })
+
+    it('renders slot when workspace store initialization fails', async () => {
+      mockTeamWorkspacesEnabled.value = true
+      mockWorkspaceStoreInitialize.mockRejectedValue(
+        new Error('Workspace init failed')
+      )
+
+      const wrapper = mountComponent()
+      await flushPromises()
+
+      expect(wrapper.find('[data-testid="slot-content"]').exists()).toBe(true)
+    })
+  })
+})