fix(sqlserver): clarify GO batch semantics

apps/desktop/src/components/structure/TableStructureEditor.vue

@@ -21,6 +21,7 @@ import { useSettingsStore, type StructureEditorDensity } from "@/stores/settings
 import { useTheme } from "@/composables/useTheme";
 import { useToast } from "@/composables/useToast";
 import { type SqlHighlighter, createShikiSqlHighlighter } from "@/lib/sql/sqlHighlighter";
+import { joinSqlStatementsForScript } from "@/lib/sql/sqlBatchScript";
 import { copyToClipboard } from "@/lib/common/clipboard";
 import { formatSqlForDisplay, sqlFormatDialectForDbType } from "@/lib/sql/sqlFormatter";
 import { queryTimeoutSecsForConnection } from "@/lib/sql/queryTimeout";
@@ -99,10 +100,10 @@ onMounted(async () => {
 
 const highlightedSql = computed(() => {
   if (!pendingStatements.value.length) return "";
-  const sql = pendingStatements.value.join("\n");
+  const sql = previewSqlText.value;
   return sqlHighlighter.value?.(sql) ?? sql;
 });
-const previewSqlText = computed(() => pendingStatements.value.join("\n"));
+const previewSqlText = computed(() => joinSqlStatementsForScript(pendingStatements.value, databaseType.value));
 
 const props = defineProps<{
   connectionId: string;

apps/desktop/src/lib/sql/sqlBatchScript.ts

@@ -0,0 +1,12 @@
+import type { DatabaseType } from "@/types/database";
+
+/**
+ * Joins generated DDL statements into a script for display/copy. SQL Server statements
+ * are separated with GO so tools that execute the copied script (SSMS, sqlcmd, DBX's
+ * GO-aware runner) treat each statement as an independent batch. GO only defines batch
+ * boundaries; whether execution continues after an error depends on the client policy.
+ */
+export function joinSqlStatementsForScript(statements: readonly string[], databaseType?: DatabaseType): string {
+  if (databaseType !== "sqlserver") return statements.join("\n");
+  return statements.map((statement) => statement.trimEnd()).join("\nGO\n");
+}