fix(ui): complete live targeted healing flow

Route ACE server commands through the existing chat path, bind the retail paperdoll hit mask instead of its obscured viewport, and prefer authoritative private health vitals. Record the user-confirmed live gate and pin the production DAT widget type in tests.

tests/AcDream.Core.Tests/Chat/WeenieErrorMessagesTests.cs

@@ -136,4 +136,12 @@ public sealed class WeenieErrorMessagesTests
             "You fail to affect Drudge because they cannot be harmed!",
             WeenieErrorMessages.Format(0x004F, "Drudge"));
     }
+
+    [Fact]
+    public void Format_HealingTargetAlreadyFull_SubstitutesParam()
+    {
+        Assert.Equal(
+            "+Acdream is already at full health!",
+            WeenieErrorMessages.Format(0x04FF, "+Acdream"));
+    }
 }