Update app.py

app.py

@@ -277,7 +277,15 @@ client = AIVisionSystem(
 )
 
 # Create Gradio interface
-with gr.Blocks(css=custom_css, title="AI 智慧回收站：次世代垃圾分類系統", theme=gr.themes.Soft()) as app:
+with gr.Blocks(css=custom_css, title="AI 智慧回收站：次世代垃圾分類系統", theme=gr.themes.Soft(), js="""
+function refresh() {
+    const url = new URL(window.location);
+    if (url.searchParams.get('__theme') !== 'dark') {
+        url.searchParams.set('__theme', 'dark');
+        window.location.href = url.href;
+    }
+}
+""") as app:
   # Title area
   gr.HTML("""
   <div class="main-header">