fix(ui): port live experience quality updates (#217)

Parse retail PrivateUpdatePropertyInt64 and route authoritative Total/Available Experience through both local-player projections so Attributes, the level meter, and Skills refresh together. Preserve the existing retail XP curve and right-align the Total XP value.

Close the user-confirmed item-give gate for #216 and record the named-retail/ACE/holtburger conformance evidence.

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

src/AcDream.Core/Player/LocalPlayerState.cs

@@ -327,6 +327,18 @@ public sealed class LocalPlayerState
         CharacterChanged?.Invoke();
     }
 
+    /// <summary>
+    /// Apply one authoritative signed 64-bit player-quality update and notify
+    /// character-sheet consumers. Retail routes 0x02CF through
+    /// <c>Handle_Qualities__PrivateUpdateInt64 @ 0x00559000</c>; Total XP (1)
+    /// and Available XP (2) are the character-window values carried here.
+    /// </summary>
+    public void OnInt64PropertyUpdate(uint propertyId, long value)
+    {
+        _properties.Int64s[propertyId] = value;
+        CharacterChanged?.Invoke();
+    }
+
     /// <summary>Apply or replace one PlayerDescription skill entry.</summary>
     public void OnSkillUpdate(
         uint skillId,