feat: add MC 1.21.4 (protocol 769) support

Add complete protocol 769 support for Minecraft 1.21.4:

- Version constants: Add 769 to supported versions, MC_1_21_4_Version constant,
  and version string mappings (including 1.21.3 -> 768 compatibility)
- Item palette: 10 new items (Resin series + Eyeblossom), generated ItemPalette1214
- Entity palette: Remove CreakingTransient (149 entities, down from 150)
- Block palette: 10 new blocks with correct blockstate ID ranges from server data
- Packet palette: Serverbound packet ID reshuffling - PickItem split into
  PickItemFromBlock/PickItemFromEntity, new PlayerLoaded packet inserted after
  PlayerInput, subsequent IDs shifted accordingly. Clientbound unchanged.
- PlayerLoaded: Send empty PlayerLoaded packet after JoinGame processing (>= 1.21.4)
- EntityMetadata/DataComponents: Reuse 1.20.6 palettes (unchanged registries)
- Update all version guard checks from MC_1_21_2 to MC_1_21_4

Made-with: Cursor

MinecraftClient/Protocol/ProtocolHandler.cs

@@ -153,7 +153,8 @@ namespace MinecraftClient.Protocol
             int[] suppoertedVersionsProtocol18 =
             {
                 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
+                575, 578, 735, 736, 751, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768,
+                769
             };
 
             if (Array.IndexOf(suppoertedVersionsProtocol18, protocolVersion) > -1)
@@ -353,6 +354,10 @@ namespace MinecraftClient.Protocol
                         return 767;
                     case "1.21.2":
                         return 768;
+                    case "1.21.3":
+                        return 768;
+                    case "1.21.4":
+                        return 769;
                     default:
                         return 0;
                 }
@@ -435,6 +440,7 @@ namespace MinecraftClient.Protocol
                 766 => "1.20.6",
                 767 => "1.21",
                 768 => "1.21.2",
+                769 => "1.21.4",
                 _ => "0.0"
             };
         }