feat: Wire MC 26.2 (protocol 776) routing and adapt Teams packet parsing

- Add MC_26_2_Version = 776 and bump all upper-bound feature gates
- Route 26.2 to the new item/block/entity palettes and
  StructuredComponentsRegistry262
- Reuse PacketPalette261 (play/config packet IDs are unchanged in 26.2;
  the only registry change is spectate_entity renamed to spectator_action
  at the same ID, which MCC does not send) and EntityMetadataPalette261
  (serializer list is identical)
- Add a 26.2 branch for Set Player Team parsing: field order changed to
  displayName, prefix, suffix, visibility, collision rule, then color as
  Optional<TeamColor> (absent maps to -1) and options byte last
- Register protocol 776 in both supported-protocol lists and the
  version string mappings; bump MCHighestVersion to 26.2

JoinGame gained a trailing onlineMode bool and LoginFinished a trailing
session UUID in 26.2; both sit after every field MCC reads, so parsing
is unaffected.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

MinecraftClient/Protocol/ProtocolHandler.cs

@@ -156,7 +156,7 @@ namespace MinecraftClient.Protocol
             {
                 4, 5, 47, 107, 108, 109, 110, 210, 315, 316, 335, 338, 340, 393, 401, 404, 477, 480, 485, 490, 498, 573,
                 575, 578, 735, 736, 751, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768,
-                769, 770, 771, 772, 773, 774, 775
+                769, 770, 771, 772, 773, 774, 775, 776
             };
 
             if (Array.IndexOf(suppoertedVersionsProtocol18, normalizedVersion) > -1)
@@ -374,6 +374,8 @@ namespace MinecraftClient.Protocol
                         return 774;
                     case "26.1":
                         return 775;
+                    case "26.2":
+                        return 776;
                     default:
                         return 0;
                 }
@@ -396,7 +398,7 @@ namespace MinecraftClient.Protocol
             4, 5, 47, 107, 108, 109, 110, 210, 315, 316, 335, 338, 340, 393, 401, 404,
             477, 480, 485, 490, 498, 573, 575, 578, 735, 736, 751, 753, 754, 755, 756,
             757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771,
-            772, 773, 774, 775
+            772, 773, 774, 775, 776
         ];
 
         /// <summary>
@@ -518,6 +520,7 @@ namespace MinecraftClient.Protocol
                 773 => "1.21.9",
                 774 => "1.21.11",
                 775 => "26.1",
+                776 => "26.2",
                 _ => "0.0"
             };
         }