Fix Chatbot: use type='messages' format to avoid gradio_client schema bug

app.py

@@ -917,7 +917,8 @@ def create_app():
                     height=500,
                     show_label=True,
                     elem_id="chatbot",
-                    bubble_full_width=False
+                    bubble_full_width=False,
+                    type="messages"
                 )
 
                 # Needs selector (hidden until stage 5)
@@ -1039,7 +1040,10 @@ def create_app():
 
             if stage == 5 and not sel_needs:
                 bot_response = "Please take a moment to select your needs from the list above, then click 'Confirm My Needs' to continue."
-                history = history + [(message, bot_response)]
+                history = history + [
+                    {"role": "user", "content": message},
+                    {"role": "assistant", "content": bot_response}
+                ]
                 return (
                     history, "", stage, session, sel_needs,
                     f"{stage}/13: {STAGE_NAMES[stage]}",
@@ -1056,7 +1060,10 @@ def create_app():
             )
 
             if error:
-                history = history + [(message, error)]
+                history = history + [
+                    {"role": "user", "content": message},
+                    {"role": "assistant", "content": error}
+                ]
                 return (
                     history, "", stage, session, sel_needs,
                     f"{stage}/13: {STAGE_NAMES[stage]}",
@@ -1065,9 +1072,12 @@ def create_app():
                 )
 
             if message != "continue":
-                history = history + [(message, response)]
+                history = history + [
+                    {"role": "user", "content": message},
+                    {"role": "assistant", "content": response}
+                ]
             else:
-                history = history + [(None, response)]
+                history = history + [{"role": "assistant", "content": response}]
 
             show_needs = (next_stage == 5)
 
@@ -1113,7 +1123,7 @@ def create_app():
             if not all_selected:
                 return (
                     all_selected,
-                    history + [(None, "Please select at least one need before continuing.")],
+                    history + [{"role": "assistant", "content": "Please select at least one need before continuing."}],
                     stage,
                     session
                 )
@@ -1127,7 +1137,10 @@ def create_app():
                 True
             )
 
-            history = history + [(f"Selected needs: {', '.join(all_selected)}", response)]
+            history = history + [
+                {"role": "user", "content": f"Selected needs: {', '.join(all_selected)}"},
+                {"role": "assistant", "content": response}
+            ]
 
             return all_selected, history, next_stage, updated_session