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

@@ -41,7 +41,7 @@ export function registerInterceptors(client: AxiosInstance, deps: AxiosBindingsD
 
       return config
     },
-    async error => { throw error },
+    error => { throw error },
   )
 
   client.interceptors.response.use(
@@ -51,7 +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)