feat(ui): finish retail toolbar controls

Discover all seven panel launchers from their DAT panel-id attributes, route mounted panels through event-driven retained window state, and ghost unavailable panels. Port Use and Examine selection/target behavior with exact Appraise dispatch and retail cursor modes.

Co-Authored-By: Codex <codex@openai.com>

src/AcDream.App/UI/UiButton.cs

@@ -123,6 +123,20 @@ public sealed class UiButton : UiElement, IUiGlobalTimeListener, IUiDatStateful
         }
     }
 
+    /// <summary>Reads a resolved enum-valued DAT attribute from this button.</summary>
+    public bool TryGetEnumAttribute(uint propertyId, out uint value)
+    {
+        if (_info.TryGetEffectiveProperty(propertyId, out var property)
+            && property.Kind == UiPropertyKind.Enum)
+        {
+            value = checked((uint)property.UnsignedValue);
+            return true;
+        }
+
+        value = 0;
+        return false;
+    }
+
     public override string ActiveCursorStateName => ActiveState;
 
     public bool TrySetRetailState(uint stateId)