feat: Add MC 26.2 palettes, registries and new sulfur/cinnabar content

Generated from the 26.2 server data reports (registries.json / blocks.json):
- ItemPalette262 (1537 items, 31 new; IDs shifted by early sulfur/cinnabar inserts)
- Palette262 blocks (1196 blocks, 32366 states, 28 new)
- EntityPalette262 (158 entities, new sulfur_cube)
- StructuredComponentsRegistry262 with new sulfur_cube_content component
  at ID 78 (shifts IDs 78-109 up by one); wire format is one ItemStackTemplate
- New ItemType/Material/EntityType enum entries for the sulfur and
  cinnabar families, MusicDiscBounce, SulfurSpike and SulfurCube

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

MinecraftClient/Mapping/EntityType.cs

@@ -150,6 +150,7 @@ namespace MinecraftClient.Mapping
         Squid,
         Stray,
         Strider,
+        SulfurCube,
         Tadpole,
         TextDisplay,
         Tnt,