feat: ocean (#16)

* feat(gameplay): add Ocean biome with water generation and heightmap adjustments

- Introduce Ocean biome enum, builder, and detection logic.
- Add ocean water building to all existing biomes and modify heightmap thresholds for low mountainous areas.
- Skip cave and river generation in Ocean (and River) biomes; avoid carving water blocks.
- Comment out border blending call and update block fill logic.

* fix(gameplay): re-enable border blending and protect water in cave gen

* refactor(generation): move ocean water build to later phase

* feat(block): add is_transitional property and refine border blending

* fix(block): set stone block as transitional

* fix(world): generate temporary chunks for surface blend neighbor data

* fix(gameplay): simplify block fill logic in blend_surface_blocks_borders

* refactor(tree): remove debug logging and unused include

assets/data/block/air.toml

@@ -5,5 +5,6 @@ is_discard = true
 is_gas = true
 is_liquid = false
 is_passable = true
+is_transitional = false
 is_transparent = true
 name = 'air'

assets/data/block/dirt.toml

@@ -5,5 +5,6 @@ is_discard = false
 is_gas = false
 is_liquid = false
 is_passable = false
+is_transitional = true
 is_transparent = false
 name = 'dirt'

assets/data/block/grass.toml

@@ -5,5 +5,6 @@ is_discard = true
 is_gas = false
 is_liquid = false
 is_passable = true
+is_transitional = false
 is_transparent = true
 name = 'grass'

assets/data/block/grass_block.toml

@@ -5,5 +5,6 @@ is_discard = false
 is_gas = false
 is_liquid = false
 is_passable = false
+is_transitional = true
 is_transparent = false
 name = 'grass_block'

assets/data/block/leaf.toml

@@ -5,5 +5,6 @@ is_discard = true
 is_gas = false
 is_liquid = false
 is_passable = false
+is_transitional = false
 is_transparent = true
 name = 'leaf'

assets/data/block/log.toml

@@ -5,5 +5,6 @@ is_discard = false
 is_gas = false
 is_liquid = false
 is_passable = false
+is_transitional = false
 is_transparent = false
 name = 'log'

assets/data/block/sand.toml

@@ -5,5 +5,6 @@ is_discard = false
 is_gas = false
 is_liquid = false
 is_passable = false
+is_transitional = true
 is_transparent = false
 name = 'sand'

assets/data/block/snowy_grass_block.toml

@@ -5,5 +5,6 @@ is_discard = false
 is_gas = false
 is_liquid = false
 is_passable = false
+is_transitional = true
 is_transparent = false
 name = 'snowy_grass_block'

assets/data/block/stone.toml

@@ -5,5 +5,6 @@ is_discard = false
 is_gas = false
 is_liquid = false
 is_passable = false
+is_transitional = true
 is_transparent = false
 name = 'stone'

assets/data/block/template.toml

@@ -7,3 +7,4 @@ is_cross_plane = false
 is_transparent = false
 is_discard = false
 is_blend = false
+is_transitional = false

assets/data/block/water.toml

@@ -5,5 +5,6 @@ is_discard = false
 is_gas = false
 is_liquid = true
 is_passable = true
+is_transitional = false
 is_transparent = true
 name = 'water'