feat: optimize typescript types and remove useless code

Author: zhaoge

website/src/languages/helpers/completionService.ts

@@ -515,7 +515,7 @@ const getColumnCompletions = async (
 	if (selectedColumns.size > 0) {
 		return result.filter((item) => {
 			const columnName =
-				(item as any)._columnText ||
+				(item as EnhancedCompletionItem)._columnText ||
 				(typeof item.label === 'string' ? item.label : (item.label as any).label);
 			return !selectedColumns.has(columnName);
 		});