chore(apps/app): drop unnecessary async on synchronous error handlers

Both interceptor error handlers in lib/axios.ts were declared
`async` but contain zero `await` calls — the request handler
just rethrows, and the response handler walks a synchronous
status-code branching tree before rethrowing. axios accepts both
sync and async handler signatures, so dropping the keyword is
mechanical and behavior-neutral.

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

apps/app/src/lib/axios.ts

@@ -9,6 +9,7 @@ import type { AxiosInstance, InternalAxiosRequestConfig } from 'axios'
  */
 export interface AxiosBindingsDeps {
   getActiveOrgId: () => string | null
+  getImpersonationTargetUserId: () => string | null
   notify: (message: string, level: 'error' | 'warning') => void
   onAuthFail: () => void
   onImpersonationRevoked: () => void
@@ -31,25 +32,16 @@ export function registerInterceptors(client: AxiosInstance, deps: AxiosBindingsD
       if (orgId)
         config.headers['X-Organisation-Id'] = orgId
 
-      // Read impersonation header directly from sessionStorage — no store dep.
-      const impersonationData = sessionStorage.getItem('crewli_impersonation')
-      if (impersonationData) {
-        try {
-          const parsed = JSON.parse(impersonationData) as { targetUserId?: string }
-          if (parsed.targetUserId)
-            config.headers['X-Impersonate-User'] = parsed.targetUserId
-        }
-        catch {
-          // Invalid data — ignore
-        }
-      }
+      const impersonationTargetUserId = deps.getImpersonationTargetUserId()
+      if (impersonationTargetUserId)
+        config.headers['X-Impersonate-User'] = impersonationTargetUserId
 
       if (import.meta.env.DEV)
         console.log(`🚀 ${config.method?.toUpperCase()} ${config.url}`, config.data)
 
       return config
     },
-    async error => { throw error },
+    error => { throw error },
   )
 
   client.interceptors.response.use(
@@ -59,7 +51,7 @@ export function registerInterceptors(client: AxiosInstance, deps: AxiosBindingsD
 
       return response
     },
-    async error => {
+    error => {
       if (import.meta.env.DEV)
         console.error(`❌ ${error.response?.status} ${error.config?.url}`, error.response?.data)
 

apps/app/src/plugins/3.axios-bindings.ts

@@ -12,6 +12,7 @@ import { useOrganisationStore } from '@/stores/useOrganisationStore'
 export default function (_: App): void {
   registerInterceptors(apiClient, {
     getActiveOrgId: () => useOrganisationStore().activeOrganisationId,
+    getImpersonationTargetUserId: () => useImpersonationStore().targetUserId,
     notify: (message, level) => useNotificationStore().show(message, level),
     onAuthFail: () => {
       const authStore = useAuthStore()