Fix session state initialization

app/assistant_v2.py

@@ -19,11 +19,6 @@ from app.lora_model import OptimizedModelLoader
 from app.performance_tracker import PerformanceTracker
 
 
-# Initialize performance tracker
-if 'perf_tracker' not in st.session_state:
-    st.session_state.perf_tracker = PerformanceTracker()
-
-
 def load_code_files(directory):
     """Load code files from directory."""
     files = []
@@ -77,6 +72,10 @@ def main():
         initial_sidebar_state="expanded"
     )
     
+    # Initialize performance tracker
+    if 'perf_tracker' not in st.session_state:
+        st.session_state.perf_tracker = PerformanceTracker()
+    
     # Custom CSS for professional dark theme
     st.markdown("""
         <style>