Fix SessionState field name in samples.py

Replace deprecated tab1/2/3_complete fields with input_complete
to match simplified SessionState model.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ui/samples.py

@@ -283,10 +283,8 @@ def load_sample(scenario_id: str) -> SessionState | None:
         name=scenario.room_data["name"],
     )
 
-    # Mark tabs as complete since we have all data
-    session.tab1_complete = True
-    session.tab2_complete = len(images) > 0
-    session.tab3_complete = True
+    # Mark input as complete since sample has all required data
+    session.input_complete = True
 
     return session