fix(completion): restore result field suggestions

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

@@ -15,14 +15,16 @@ function fallbackColumnInfo(name: string): ColumnInfo {
 
 export function tableMetaForDataTab(tab: QueryTab | undefined): DataTabTableMeta | undefined {
   if (!tab || tab.mode !== "data") return undefined;
-  if (tab.tableMeta) return tab.tableMeta;
+  if (tab.tableMeta?.columns.length) return tab.tableMeta;
   const tableName = tab.title.trim();
   if (!tableName) return undefined;
 
+  // Keep filters usable when the table identity loaded but its column metadata did not.
   return {
+    ...tab.tableMeta,
     schema: tab.schema,
     tableName,
     columns: (tab.result?.columns ?? []).map(fallbackColumnInfo),
-    primaryKeys: [],
+    primaryKeys: tab.tableMeta?.primaryKeys ?? [],
   };
 }