fix build errors

app.py

@@ -404,7 +404,7 @@ def create_chatbot():
         "How can I support you today? You can share anything about what you're dealing with—mental health concerns, alcohol or drug use, support for a loved one, or help finding treatment resources."
     )
 
-    with gr.Blocks(title="Harbor") as demo:
+    with gr.Blocks(title="Harbor", theme=THEME, css=CSS) as demo:
 
         # ── Landing Page ──────────────────────────────────────────────
         with gr.Column(visible=True) as landing_page:
@@ -468,6 +468,7 @@ def create_chatbot():
             chatbot_display = gr.Chatbot(
                 value=[{"role": "assistant", "content": OPENING_MESSAGE}],
                 label="⚓ Harbor",
+                type="messages",
             )
             with gr.Row():
                 msg_input = gr.Textbox(
@@ -517,4 +518,4 @@ def create_chatbot():
 
 if __name__ == "__main__":
     demo = create_chatbot()
-    demo.launch(share=True, theme=THEME, css=CSS)
+    demo.launch(share=True)