fix(block): melt snow layers under high block light (#2419)

* fix(block): melt snow layers under high block light

Snow layers never melted because the block had no random_tick handler.
Mirror vanilla SnowLayerBlock.randomTick: on a random tick, remove the
layer when the block light level at its position exceeds 11 (e.g. from
a nearby torch).

Fixes #2179

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

* style: apply rustfmt

pumpkin/src/block/blocks/snow.rs

@@ -10,7 +10,7 @@ use pumpkin_world::{
 
 use crate::block::{
     BlockBehaviour, BlockFuture, GetStateForNeighborUpdateArgs, OnPlaceArgs, OnScheduledTickArgs,
-    UseWithItemArgs, registry::BlockActionResult,
+    RandomTickArgs, UseWithItemArgs, registry::BlockActionResult,
 };
 
 #[pumpkin_block("minecraft:snow")]
@@ -86,6 +86,18 @@ impl BlockBehaviour for LayeredSnowBlock {
         })
     }
 
+    fn random_tick<'a>(&'a self, args: RandomTickArgs<'a>) -> BlockFuture<'a, ()> {
+        Box::pin(async move {
+            // Snow layers melt when lit by block light above level 11,
+            // e.g. from a nearby torch.
+            if args.world.get_block_light_level(args.position).unwrap_or(0) > 11 {
+                args.world
+                    .break_block(args.position, None, BlockFlags::empty())
+                    .await;
+            }
+        })
+    }
+
     fn get_state_for_neighbor_update<'a>(
         &'a self,
         args: GetStateForNeighborUpdateArgs<'a>,