feat(ui): port retail selected-item mana

Parse and route the complete 0x0264 guid/fraction/valid response, send exact 0x0263 item-mana queries, and reproduce retail meter visibility plus guid-zero cancellation for mana and health selection changes. Keep the behavior in Core state and the retained selected-object controller with wire/state/UI conformance coverage.

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

tests/AcDream.Core.Net.Tests/GameEventWiringTests.cs

@@ -449,6 +449,30 @@ public sealed class GameEventWiringTests
         Assert.Equal(1u, items.Get(0x50000A02u)!.ContainerTypeHint);
     }
 
+    [Fact]
+    public void WireAll_QueryItemManaResponse_RoutesValidityToItemManaState()
+    {
+        var dispatcher = new GameEventDispatcher();
+        var itemMana = new ItemManaState();
+        (uint Guid, float Percent, bool Valid)? observed = null;
+        itemMana.ItemManaChanged += (guid, percent, valid) => observed = (guid, percent, valid);
+        GameEventWiring.WireAll(
+            dispatcher, new ClientObjectTable(), new CombatState(), new Spellbook(), new ChatLog(),
+            itemMana: itemMana);
+
+        byte[] payload = new byte[12];
+        BinaryPrimitives.WriteUInt32LittleEndian(payload, 0x50000A01u);
+        BinaryPrimitives.WriteSingleLittleEndian(payload.AsSpan(4), 0.375f);
+        BinaryPrimitives.WriteUInt32LittleEndian(payload.AsSpan(8), 1u);
+        var envelope = GameEventEnvelope.TryParse(
+            WrapEnvelope(GameEventType.QueryItemManaResponse, payload));
+
+        dispatcher.Dispatch(envelope!.Value);
+
+        Assert.Equal((0x50000A01u, 0.375f, true), observed);
+        Assert.True(itemMana.HasMana(0x50000A01u));
+    }
+
     [Fact]
     public void UseDone_releasesAppBusyOwnerThroughCallback()
     {

tests/AcDream.Core.Net.Tests/Messages/GameEventDispatcherTests.cs

@@ -177,6 +177,24 @@ public sealed class GameEventDispatcherTests
         Assert.Equal(0.42f, parsed.Value.HealthPercent, 4);
     }
 
+    [Fact]
+    public void ParseQueryItemManaResponse_RoundTripIncludingValidity()
+    {
+        // CM_Item::DispatchUI_QueryItemManaResponse @ 0x006A84D0 reads all three fields.
+        byte[] payload = new byte[12];
+        BinaryPrimitives.WriteUInt32LittleEndian(payload, 0x50000A01u);
+        BinaryPrimitives.WriteSingleLittleEndian(payload.AsSpan(4), 0.625f);
+        BinaryPrimitives.WriteUInt32LittleEndian(payload.AsSpan(8), 1u);
+
+        var parsed = GameEvents.ParseQueryItemManaResponse(payload);
+
+        Assert.NotNull(parsed);
+        Assert.Equal(0x50000A01u, parsed!.Value.ItemGuid);
+        Assert.Equal(0.625f, parsed.Value.ManaPercent);
+        Assert.True(parsed.Value.Valid);
+        Assert.Null(GameEvents.ParseQueryItemManaResponse(payload.AsSpan(0, 8)));
+    }
+
     [Fact]
     public void ParseWieldObject_acceptsAceEightBytePayload()
     {

tests/AcDream.Core.Net.Tests/Messages/SocialActionsTests.cs

@@ -18,6 +18,22 @@ public sealed class SocialActionsTests
             BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(12)));
     }
 
+    [Fact]
+    public void BuildQueryItemMana_HasOpcode0x0263AndGuid()
+    {
+        // CM_Item::Event_QueryItemMana @ 0x006A8610: F7B1, seq, 0x0263, guid.
+        byte[] body = SocialActions.BuildQueryItemMana(seq: 4, itemGuid: 0x50000A01u);
+
+        Assert.Equal(16, body.Length);
+        Assert.Equal(SocialActions.GameActionEnvelope,
+            BinaryPrimitives.ReadUInt32LittleEndian(body));
+        Assert.Equal(4u, BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(4)));
+        Assert.Equal(SocialActions.QueryItemManaOpcode,
+            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
+        Assert.Equal(0x50000A01u,
+            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(12)));
+    }
+
     [Fact]
     public void BuildPingRequest_HasOpcode0x01E9()
     {

tests/AcDream.Core.Net.Tests/WorldSessionCombatTests.cs

@@ -141,6 +141,19 @@ public sealed class WorldSessionCombatTests
         Assert.Equal(SocialActions.BuildQueryHealth(1, 0x50000007u), captured);
     }
 
+    [Fact]
+    public void SendQueryItemMana_UsesRetailQueryItemManaBuilder()
+    {
+        using var session = NewSession();
+        byte[]? captured = null;
+        session.GameActionCapture = body => captured = body;
+
+        session.SendQueryItemMana(0x50000A01u);
+
+        Assert.NotNull(captured);
+        Assert.Equal(SocialActions.BuildQueryItemMana(1, 0x50000A01u), captured);
+    }
+
     [Fact]
     public void SendUseWithTarget_UsesRetailBuilder()
     {