Review fix: omitted picker submissions carry the allowlist forward

Review round 6 (Codex gpt-5.6-terra, MEDIUM): HA replaces entry.options
wholesale, so a submission omitting the picker dropped the allowlist
copy and left only the stale config-flow copy in entry data — a later
database loss would resurrect removed admins. Omitted submissions now
carry the current DB allowlist forward on the options copy. The
legacy-path test updated to assert the carried copy. Suite: 910 passed.

custom_components/nestquest/options_flow.py

@@ -213,6 +213,13 @@ class NestQuestOptionsFlow(config_entries.OptionsFlowWithConfigEntry):
         }
         if admin_ids_present:
             data[CONF_ADMIN_USER_IDS] = admin_ids
+        elif admin_default:
+            # HA replaces entry.options wholesale, so an omitted picker
+            # field must carry the CURRENT allowlist forward: dropping
+            # it would leave only the stale config-flow copy in entry
+            # data, and a later database loss would resurrect admins
+            # the owner has since removed.
+            data[CONF_ADMIN_USER_IDS] = list(admin_default)
         return self.async_create_entry(title="NestQuest", data=data)
 
     def _current_values(self) -> dict[str, Any]: