Phase 4: Architecture & tooling investment

Fixes a real N+1 API-call bug (per-cell project-member fetches in shot/asset
task-status cells, now a shared cached store), replaces a polling-based
in-flight request de-dup with promise memoization, adds markRaw() around
icon components in reactive state, and fixes a deep watcher that re-scanned
the whole projects array just to trigger thumbnail loading.

Introduces useAsyncAction and usePermission composables to cut duplicated
store boilerplate and duplicated role/admin checks, applied only where the
existing code was a clean match rather than forced onto everything. Extracts
assets.ts's shared per-asset optimistic-update/rollback helper without
merging the single and bulk API paths, which hit genuinely different
endpoints. Adds toast-on-error for previously-silent secondary loads and
fixes a dead try/catch in the router's auth-init guard along the way.

Also fixes a thumbnail-loading regression introduced earlier in this same
pass: the new ID-keyed watcher never fired on a repeat visit to the Projects
page when the store already held the same project list, so thumbnails
(local component state, reset per mount) silently stopped loading after the
first visit. Replaced the watcher with a direct call after each fetch.

Table virtualization, splitting the two largest view files, broad store
caching, and moving domain types into types/ were scoped out as separate,
higher-risk follow-ups (documented in frontend_tasks.md).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/components/shot/EditableTaskStatus.vue

@@ -169,8 +169,9 @@ import { User, Search, Check, X } from 'lucide-vue-next'
 import TaskStatusBadge from '@/components/task/TaskStatusBadge.vue'
 import { TaskStatus } from '@/services/shot'
 import { taskService } from '@/services/task'
-import { projectService, type ProjectMember } from '@/services/project'
+import type { ProjectMember } from '@/services/project'
 import { useTaskStatusesStore } from '@/stores/taskStatuses'
+import { useProjectMembersStore } from '@/stores/projectMembers'
 
 interface StatusOption {
   id: string
@@ -198,11 +199,12 @@ const emit = defineEmits<Emits>()
 
 // Use the shared task statuses store instead of direct API calls
 const taskStatusesStore = useTaskStatusesStore()
+const projectMembersStore = useProjectMembersStore()
 
 const isUpdating = ref(false)
 const isAssigning = ref(false)
-const isLoadingMembers = ref(false)
-const projectMembers = ref<ProjectMember[]>([])
+const projectMembers = computed<ProjectMember[]>(() => projectMembersStore.getMembers(props.projectId) || [])
+const isLoadingMembers = computed(() => projectMembersStore.isLoading(props.projectId))
 const searchQuery = ref('')
 
 // Filtered project members based on search query
@@ -306,27 +308,18 @@ const fetchStatuses = async () => {
   }
 }
 
-// Load project members
+// Load project members (shared cache across all EditableTaskStatus instances for this project)
 const loadProjectMembers = async () => {
-  if (projectMembers.value.length > 0) return // Already loaded
-  
-  isLoadingMembers.value = true
   try {
-    console.log('Loading project members for project:', props.projectId)
-    projectMembers.value = await projectService.getProjectMembers(props.projectId)
-    console.log('Loaded project members:', projectMembers.value)
+    await projectMembersStore.fetchProjectMembers(props.projectId)
   } catch (error) {
     console.error('Failed to load project members:', error)
-  } finally {
-    isLoadingMembers.value = false
   }
 }
 
 // Ensure members are loaded when popover is about to open
 const ensureMembersLoaded = () => {
-  console.log('Ensuring project members are loaded')
   if (projectMembers.value.length === 0) {
-    console.log('Loading project members on button click')
     loadProjectMembers()
   }
 }
@@ -407,7 +400,6 @@ onMounted(() => {
 // Refetch statuses when projectId changes
 watch(() => props.projectId, () => {
   fetchStatuses()
-  // Clear project members when project changes
-  projectMembers.value = []
+  loadProjectMembers()
 })
 </script>