basic react API

frontend/src/hooks/useLocalChatHistory.js

@@ -0,0 +1,19 @@
+import { useState, useEffect } from "react";
+
+export default function useLocalChatHistory(key, initialValue) {
+  const [state, setState] = useState(() => {
+    try {
+      const stored = window.localStorage.getItem(key);
+      return stored ? JSON.parse(stored) : initialValue;
+    } catch (err) {
+      console.error("Error parsing localStorage:", err);
+      return initialValue;
+    }
+  });
+
+  useEffect(() => {
+    window.localStorage.setItem(key, JSON.stringify(state));
+  }, [key, state]);
+
+  return [state, setState];
+}