Add comprehensive tests for ast-grep and tree-sitter relationship extraction

- Introduced test suite for AstGrepPythonProcessor covering pattern definitions, parsing, and relationship extraction.
- Added comparison tests between tree-sitter and ast-grep for consistency in relationship extraction.
- Implemented tests for ast-grep binding module to verify functionality and availability.
- Ensured tests cover various scenarios including inheritance, function calls, and imports.

ccw/frontend/src/components/dashboard/widgets/WorkflowTaskWidget.tsx

@@ -704,7 +704,7 @@ function WorkflowTaskWidgetComponent({ className }: WorkflowTaskWidgetProps) {
                       const isLastOdd = currentSession.tasks!.length % 2 === 1 && index === currentSession.tasks!.length - 1;
                       return (
                         <div
-                          key={task.task_id}
+                          key={`${currentSession.session_id}-${task.task_id}`}
                           className={cn(
                             'flex items-center gap-2 p-2 rounded hover:bg-background/50 transition-colors',
                             isLastOdd && 'col-span-2'