fix(app): wrap daemon settings section in React Query with loading state

Prevents the daemon section from flashing "not running" / "PID —" while
IPC data loads. The whole card now shows a spinner until the first fetch
completes, and mutations (restart/stop/start) optimistically update the
query cache with the returned status.

packages/app/src/desktop/hooks/use-daemon-status.ts

@@ -0,0 +1,53 @@
+import { useCallback } from "react";
+import { useQuery, useQueryClient } from "@tanstack/react-query";
+import {
+  getDesktopDaemonLogs,
+  getDesktopDaemonStatus,
+  shouldUseDesktopDaemon,
+  type DesktopDaemonLogs,
+  type DesktopDaemonStatus,
+} from "@/desktop/daemon/desktop-daemon";
+
+const DAEMON_STATUS_QUERY_KEY = ["desktopDaemonStatus"] as const;
+
+interface DaemonStatusData {
+  status: DesktopDaemonStatus;
+  logs: DesktopDaemonLogs;
+}
+
+export function useDaemonStatus() {
+  const queryClient = useQueryClient();
+  const enabled = shouldUseDesktopDaemon();
+
+  const query = useQuery<DaemonStatusData>({
+    queryKey: DAEMON_STATUS_QUERY_KEY,
+    enabled,
+    staleTime: 30_000,
+    refetchOnMount: "always",
+    queryFn: async () => {
+      const [status, logs] = await Promise.all([getDesktopDaemonStatus(), getDesktopDaemonLogs()]);
+      return { status, logs };
+    },
+  });
+
+  const setStatus = useCallback(
+    (status: DesktopDaemonStatus) => {
+      queryClient.setQueryData<DaemonStatusData>(DAEMON_STATUS_QUERY_KEY, (prev) =>
+        prev ? { ...prev, status } : undefined,
+      );
+    },
+    [queryClient],
+  );
+
+  const refetch = useCallback(() => {
+    void queryClient.invalidateQueries({ queryKey: DAEMON_STATUS_QUERY_KEY });
+  }, [queryClient]);
+
+  return {
+    data: query.data ?? null,
+    isLoading: query.isLoading,
+    error: query.error instanceof Error ? query.error.message : null,
+    setStatus,
+    refetch,
+  };
+}