fix(adminui): preserve edited alarm fields on Galaxy address re-pick

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Shared/Uns/TagModal.razor

@@ -336,14 +336,12 @@
     private void OnGalaxyAddressPicked(string address)
     {
         _galaxyAddress = address;
-        // A fresh {FullName} blob would drop any tag-level historize the operator already set on this
-        // edit; re-merge it so re-picking a Galaxy address never silently clears "Historize this tag".
-        var config = TagHistorizeConfig.Set(
-            JsonSerializer.Serialize(new { FullName = address }),
-            _historizeState.IsHistorized,
-            _historizeState.HistorianTagname);
-        // Re-merge any array intent for the same reason — a fresh {FullName} blob would otherwise drop it.
-        config = TagArrayConfig.Set(config, _arrayState.IsArray, _arrayState.ArrayLength);
+        // Re-picking a Galaxy address owns ONLY the address-derived FullName key — apply it over the EXISTING
+        // TagConfig so every other user-edited field survives verbatim. This preserves a hand-authored `alarm`
+        // object (FB-4: a re-pick must never clobber edited alarm fields) as well as the root history/array
+        // intent and any driver/unknown keys. TagConfigJson.SetFullName uses the same preserve-unknown idiom
+        // as the historize/array merge seams.
+        var config = TagConfigJson.SetFullName(_form.TagConfig, address);
         _form.TagConfig = _galaxyPickedIsAlarm
             ? NativeAlarmModel.SeedDefaultAlarm(config)
             : config;