fix(gbase): generate GBase 8s table DDL with Informix dialect

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

@@ -10640,6 +10640,7 @@ async function copyAlterColumnSql() {
 
   const options: BuildSingleColumnAlterSqlOptions = {
     databaseType: props.databaseType,
+    driverProfile: props.connectionId ? connectionStore.getConfig(props.connectionId)?.driver_profile : undefined,
     schema: props.tableMeta?.schema,
     tableName: props.tableMeta!.tableName,
     column: draft,

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

@@ -1623,6 +1623,7 @@ function scheduleSqlPreviewRefresh() {
 function structureChangeOptions(): BuildTableStructureChangeSqlOptions {
   return {
     databaseType: databaseType.value,
+    driverProfile: connection.value?.driver_profile,
     schema: props.schema,
     tableName: isCreateMode.value ? newTableName.value.trim() : props.tableName || "",
     // Do not let a draft created by an older build submit properties that the

apps/desktop/src/lib/table/tableStructureEditorSql.ts

@@ -77,6 +77,10 @@ export interface EditableStructureTrigger {
 
 export interface BuildTableStructureChangeSqlOptions {
   databaseType?: DatabaseType;
+  /** Driver profile reported by the connection (e.g. `"gbase8s"`). GBase 8s is
+   * Informix-compatible rather than MySQL-compatible like the rest of the
+   * `Gbase` family, so this disambiguates which dialect the backend generates. */
+  driverProfile?: string | null;
   schema?: string;
   tableName: string;
   columns: EditableStructureColumn[];
@@ -118,6 +122,7 @@ export interface SqliteTableStructureChangePreview extends TableStructureChangeS
 
 export interface BuildSingleColumnAlterSqlOptions {
   databaseType?: DatabaseType;
+  driverProfile?: string | null;
   schema?: string;
   tableName: string;
   column: EditableStructureColumn;