diff --git a/next.config.js b/next.config.js
index 6b1a3e0..bc37f80 100644
--- a/next.config.js
+++ b/next.config.js
@@ -4,6 +4,10 @@ const withNextPluginPreval = createNextPluginPreval();
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   reactStrictMode: false,
+  // Explicitly allow znjj.wangxin93.eu.org for Dev Origin, per future Next.js requirement.
+  allowedDevOrigins: [
+    "znjj.wangxin93.eu.org",
+  ],
 };
 
 module.exports = withNextPluginPreval(nextConfig);
diff --git a/src/components/chat/ChatOverlay.tsx b/src/components/chat/ChatOverlay.tsx
index 8fc020e..5412687 100644
--- a/src/components/chat/ChatOverlay.tsx
+++ b/src/components/chat/ChatOverlay.tsx
@@ -11,7 +11,7 @@ export interface ChatOverlayProps {
   isVisible: boolean;
   position: { x: number; y: number };
   onPositionChange: (position: { x: number; y: number }) => void;
-  containerRef: React.RefObject<HTMLDivElement>;
+  containerRef: React.RefObject<HTMLDivElement | null>;
   onToggle: () => void;
 }
 
diff --git a/src/components/playground/PhoneSimulator.tsx b/src/components/playground/PhoneSimulator.tsx
index f8e4932..61f35fa 100644
--- a/src/components/playground/PhoneSimulator.tsx
+++ b/src/components/playground/PhoneSimulator.tsx
@@ -1179,7 +1179,7 @@ export function PhoneSimulator({
         <ChatOverlay
           agentAudioTrack={voiceAssistant.audioTrack}
           accentColor={config.settings.theme_color}
-          inputDisabled={phoneMode === "important_message" || phoneMode === "hand_off"}
+          inputDisabled={phoneMode === "hand_off"}
           isVisible={showChatOverlay}
           position={chatOverlayPosition}
           onPositionChange={setChatOverlayPosition}