fix(query): preserve structured backend errors

apps/desktop/src/components/grid/DataGrid.vue

@@ -67,6 +67,7 @@ import DataGridQueryControls from "@/components/grid/DataGridQueryControls.vue";
 import TemporalCellEditor from "@/components/grid/TemporalCellEditor.vue";
 import EnumCellEditor from "@/components/grid/EnumCellEditor.vue";
 import type { QueryResult, ColumnInfo, DatabaseType, ForeignKeyInfo, IndexInfo, TriggerInfo, TableInfoTab } from "@/types/database";
+import { isQueryExecutionErrorResult } from "@/lib/query/queryResultError";
 import { tableObjectSourceKind } from "@/lib/table/tableObjectSourceKind";
 import { tableColumnDefaultDisplayValue } from "@/lib/table/tableColumnDefaultPresentation";
 import { shouldNavigateFromTableInfoColumnClick } from "@/lib/table/tableInfoColumnNavigation";
@@ -3577,7 +3578,7 @@ watch(
   },
   { immediate: true },
 );
-const isErrorResult = computed(() => props.result.columns.length === 1 && props.result.columns[0] === "Error" && props.result.rows.length > 0);
+const isErrorResult = computed(() => isQueryExecutionErrorResult(props.result) && props.result.rows.length > 0);
 const errorMessage = computed(() => (isErrorResult.value ? String(props.result.rows[0]?.[0] ?? "") : ""));
 // --- Selection composable ---
 const selection = useDataGridSelection({