fix(gui): ProjectStatsDialog uses correct ProjectData fields

- Remove references to non-existent description, session_count, last_session
- Use project.type, project.status, project.metadata for description
- Fixes AttributeError when viewing project stats

ui/main_window.py

@@ -152,16 +152,16 @@ class ProjectStatsDialog(QDialog):
         
         stats_layout.addRow("ID:", QLabel(str(self.project.id)))
         stats_layout.addRow("Name:", QLabel(self.project.name))
-        stats_layout.addRow("Description:", QLabel(self.project.description or "N/A"))
+        stats_layout.addRow("Type:", QLabel(self.project.type))
+        stats_layout.addRow("Status:", QLabel(self.project.status))
+        
+        # Description from metadata
+        description = self.project.metadata.get('description', 'N/A') if self.project.metadata else 'N/A'
+        stats_layout.addRow("Description:", QLabel(description))
         
         created = self.project.created_at.strftime("%Y-%m-%d %H:%M") if self.project.created_at else "N/A"
         stats_layout.addRow("Created:", QLabel(created))
         
-        stats_layout.addRow("Total Sessions:", QLabel(str(self.project.session_count)))
-        
-        last = self.project.last_session.strftime("%Y-%m-%d %H:%M") if self.project.last_session else "Never"
-        stats_layout.addRow("Last Session:", QLabel(last))
-        
         layout.addWidget(stats_group)
         
         # Close button