replace animation state machines with blend trees

scripts/units/abstract/unit.gd

@@ -24,9 +24,6 @@ var _advance_anim_delta_accum: float = 0
 @onready var nav_agent: NavigationAgent3D = $NavigationAgent3D
 @onready var ui_origin: Node3D = $UiOrigin
 @onready var animation_tree: AnimationTree = $AnimationTree
-@onready var animation_playback: AnimationNodeStateMachinePlayback = (
-		animation_tree.get("parameters/playback")
-)
 @onready var anim_advance_indicator: VisualInstance3D = $AnimAdvanceIndicator
 @onready var visibility_notifier: VisibleOnScreenNotifier3D = (
 		$VisibleOnScreenNotifier3D
@@ -116,7 +113,7 @@ func _handle_animation(delta: float) -> void:
 			velocity.length() / _move_speed,
 			delta * LOCOMOTION_CHANGE_SPEED
 	)
-	animation_tree.set("parameters/locomotion/blend_position", _locomotion_value)
+	animation_tree["parameters/locomotion_blend/blend_amount"] = _locomotion_value
 
 	_advance_anim_delta_accum += delta
 

scripts/units/aphid.gd

@@ -88,7 +88,9 @@ func _handle_honeydew_spawn(delta: float) -> void:
 	_put_honeydew(new_honeydew)
 
 	audio_player.play_sound(SoundManager.aphid_poop())
-	animation_playback.travel("plop")
+	animation_tree["parameters/plop_oneshot/request"] = (
+			AnimationNodeOneShot.ONE_SHOT_REQUEST_FIRE
+	)
 
 	_set_spawn_timer()
 

scripts/units/components/gathering.gd

@@ -146,7 +146,9 @@ func _pick_up() -> void:
 			_get_nth_pile_pos(_carrying_items.size() - 1)
 	).tween_finished
 	audio_player.play_sound(SoundManager.pop())
-	_unit.animation_playback.travel("plop_down")
+	_unit.animation_tree["parameters/plop_down_oneshot/request"] = (
+			AnimationNodeOneShot.ONE_SHOT_REQUEST_FIRE
+	)
 
 	await get_tree().create_timer(_pickup_interval).timeout
 	
@@ -171,7 +173,9 @@ func _deposit() -> void:
 			return
 
 		var item := _carrying_items.pop_back() as Honeydew
-		_unit.animation_playback.travel("plop_up")
+		_unit.animation_tree["parameters/plop_up_oneshot/request"] = (
+				AnimationNodeOneShot.ONE_SHOT_REQUEST_FIRE
+		)
 		audio_player.play_sound(SoundManager.swoosh())
 
 		await item.start_tweening(