docs(core): mark data store fallback temporary and list special cases

src/lib/elements/element_data_store.svelte

@@ -227,6 +227,9 @@ async function load_data_store() {
                     `ae_e_data_store [${ds_code}]: Not found in context (Status ${status_code}). Trying global fallback.`
                 );
 
+            // TEMPORARY: same global-default fallback as core__data_store.ts.
+            // This should go away once the backend can answer with JWT-backed,
+            // account-scoped defaults only.
             ds_results = await api.get_data_store({
                 api_cfg,
                 code: ds_code,