feat: add dust2 level builder, player movement controller, and UI menu components

debug/dust2_level_builder.gd

@@ -28,12 +28,13 @@ func _build_geometry() -> void:
 		fill.light_energy = 0.3
 
 	_build_dust2_layout()
-	_build_player()
-	
-	# Override player spawn point for Dust 2
-	if _player:
-		_player.global_position = Vector3(0, 1, 50)
-		_player.look_at(Vector3(0, 1, 0), Vector3.UP)
+
+func _spawn_player(pid: int) -> CharacterBody3D:
+	var player = super._spawn_player(pid)
+	player.position = Vector3(randf_range(-2, 2), 1, 50 + randf_range(-2, 2))
+	# Looking at (0,1,0) from (0,1,50) is facing straight down the -Z axis, which is rotation = 0,0,0
+	player.rotation = Vector3.ZERO
+	return player
 
 func _build_dust2_layout() -> void:
 	# Materials