add skip navigation, page title, and global ARIA live region

src/hooks/useAnnounce.ts

@@ -0,0 +1,19 @@
+import { create } from "zustand";
+
+interface AnnounceState {
+  message: string;
+  announce: (text: string) => void;
+}
+
+export const useAnnounceStore = create<AnnounceState>((set) => ({
+  message: "",
+  announce: (text) => {
+    // Clear first to ensure re-announcement of identical messages
+    set({ message: "" });
+    requestAnimationFrame(() => set({ message: text }));
+  },
+}));
+
+export function useAnnounce() {
+  return useAnnounceStore((s) => s.announce);
+}