feat(chat): created basic chat layout

src/components/ui/ChatHeader.jsx

@@ -0,0 +1,19 @@
+import React from "react";
+
+export default function ChatHeader({ title = "AI Assistant" }) {
+  return (
+    <header className="flex items-center justify-between px-4 py-3 bg-gradient-to-r from-slate-800 to-slate-900 text-white">
+      <div className="flex items-center gap-3">
+        <div className="w-10 h-10 bg-indigo-500 rounded flex items-center justify-center font-bold">
+          AI
+        </div>
+        <div>
+          <h1 className="text-lg font-semibold">{title}</h1>
+          <p className="text-sm text-slate-300">
+            Ask anything — AI is listening
+          </p>
+        </div>
+      </div>
+    </header>
+  );
+}