perf: remove unnecessary query cache for Tauri local IPC

Tauri IPC calls are in-process (microsecond latency), so the 5-minute
staleTime and disabled refetchOnWindowFocus from web app templates are
counterproductive. Set staleTime to 0 and enable refetchOnWindowFocus
so external config changes are reflected immediately.

src/lib/query/queryClient.ts

@@ -4,8 +4,8 @@ export const queryClient = new QueryClient({
   defaultOptions: {
     queries: {
       retry: 1,
-      refetchOnWindowFocus: false,
-      staleTime: 1000 * 60 * 5,
+      refetchOnWindowFocus: true,
+      staleTime: 0,
     },
     mutations: {
       retry: false,