fix: add QCheckBox import and fix sqlite3.Row access

- Add missing QCheckBox to PyQt6.QtWidgets import
- Fix sqlite3.Row access - use 'in row.keys()' instead of .get()
- Fixes template and session loading errors

ui/main_window.py

@@ -20,7 +20,7 @@ from PyQt6.QtWidgets import (
     QDialog, QLineEdit, QFormLayout, QDialogButtonBox,
     QMessageBox, QGroupBox, QFrame, QApplication,
     QTreeWidget, QTreeWidgetItem, QHeaderView, QComboBox,
-    QGridLayout, QToolButton
+    QGridLayout, QToolButton, QCheckBox
 )
 from PyQt6.QtCore import Qt, pyqtSignal, QTimer, QSize, QSettings
 from PyQt6.QtGui import QAction, QFont, QColor, QPalette, QIcon
@@ -1069,7 +1069,9 @@ class MainWindow(QMainWindow):
             )
             
             for proj in projects:
-                activity = ActivityType.from_string(proj.get('type', 'hunting'))
+                # sqlite3.Row doesn't have .get() method
+                proj_type = proj['type'] if 'type' in proj.keys() else 'hunt'
+                activity = ActivityType.from_string(proj_type)
                 # Get session count
                 count_result = self.db.fetchone(
                     "SELECT COUNT(*) as count FROM sessions WHERE project_id = ?",
@@ -1086,12 +1088,16 @@ class MainWindow(QMainWindow):
                 if last_result and last_result['last']:
                     last_session = datetime.fromisoformat(last_result['last'])
                 
+                # Handle description which might not exist in old databases
+                description = proj['description'] if 'description' in proj.keys() else ''
+                created_at = proj['created_at'] if 'created_at' in proj.keys() else None
+                
                 template = SessionTemplate(
                     id=proj['id'],
                     name=proj['name'],
                     activity_type=activity,
-                    description=proj.get('description', ''),
-                    created_at=datetime.fromisoformat(proj['created_at']) if proj.get('created_at') else None,
+                    description=description,
+                    created_at=datetime.fromisoformat(created_at) if created_at else None,
                     session_count=session_count,
                     last_session=last_session
                 )
@@ -1192,13 +1198,16 @@ class MainWindow(QMainWindow):
             """)
             
             for row in rows:
-                activity = ActivityType.from_string(row.get('type', 'hunting'))
+                # sqlite3.Row doesn't have .get() method, use direct access
+                row_type = row['type'] if 'type' in row.keys() else 'hunt'
+                activity = ActivityType.from_string(row_type)
                 
                 # Calculate duration
                 started = datetime.fromisoformat(row['started_at'])
                 duration = 0
-                if row.get('ended_at'):
-                    ended = datetime.fromisoformat(row['ended_at'])
+                ended_at = row['ended_at'] if 'ended_at' in row.keys() else None
+                if ended_at:
+                    ended = datetime.fromisoformat(ended_at)
                     duration = int((ended - started).total_seconds() / 60)
                 elif row['status'] == 'running':
                     duration = int((datetime.now() - started).total_seconds() / 60)
@@ -1215,7 +1224,7 @@ class MainWindow(QMainWindow):
                     duration_minutes=duration,
                     total_cost=total_cost,
                     total_return=total_return,
-                    status=row.get('status', 'unknown')
+                    status=row['status'] if 'status' in row.keys() else 'unknown'
                 )
                 sessions.append(session)
         except Exception as e: