feat(nursery): add Cradle component with pendulum rocking animation

scenes/objects/Cradle.tscn

@@ -0,0 +1,31 @@
+[gd_scene load_steps=2 format=3 uid="uid://cozypaw_cradle"]
+
+[ext_resource type="Script" path="res://scripts/objects/cradle.gd" id="1_cradle"]
+
+[node name="Cradle" type="Node2D"]
+script = ExtResource("1_cradle")
+
+[node name="SuspensionLeft" type="ColorRect" parent="."]
+color = Color(0.75, 0.65, 0.50, 1)
+size = Vector2(4, 50)
+position = Vector2(-25, 0)
+
+[node name="SuspensionRight" type="ColorRect" parent="."]
+color = Color(0.75, 0.65, 0.50, 1)
+size = Vector2(4, 50)
+position = Vector2(21, 0)
+
+[node name="CradleBasket" type="ColorRect" parent="."]
+color = Color(0.88, 0.82, 0.72, 1)
+size = Vector2(70, 40)
+position = Vector2(-35, 50)
+
+[node name="CradleRim" type="ColorRect" parent="."]
+color = Color(0.95, 0.90, 0.82, 1)
+size = Vector2(70, 8)
+position = Vector2(-35, 46)
+
+[node name="BabyBlanket" type="ColorRect" parent="."]
+color = Color(0.90, 0.84, 0.96, 1)
+size = Vector2(58, 22)
+position = Vector2(-29, 56)

scripts/objects/cradle.gd

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+## Cradle — rocks with a pendulum rotation when tapped.
+class_name Cradle extends Node2D
+
+enum State { IDLE, ROCKING }
+
+const ROCK_ANGLE: float = 15.0
+const ROCK_DURATION: float = 0.5
+const BUTTON_HALF_SIZE: float = 80.0
+
+var _state: State = State.IDLE
+
+
+func _input(event: InputEvent) -> void:
+	if _state != State.IDLE:
+		return
+	var screen_pos: Vector2
+	if event is InputEventScreenTouch and event.pressed:
+		screen_pos = event.position
+	elif event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_LEFT:
+		screen_pos = event.position
+	else:
+		return
+	var canvas_transform: Transform2D = get_viewport().get_canvas_transform()
+	var world_pos: Vector2 = canvas_transform.affine_inverse() * screen_pos
+	var local_pos: Vector2 = to_local(world_pos)
+	if abs(local_pos.x) <= BUTTON_HALF_SIZE and abs(local_pos.y) <= BUTTON_HALF_SIZE:
+		_start_rocking()
+
+
+func _start_rocking() -> void:
+	_state = State.ROCKING
+	var tween: Tween = create_tween()
+	tween.set_ease(Tween.EASE_IN_OUT)
+	tween.set_trans(Tween.TRANS_SINE)
+	tween.tween_property(self, "rotation_degrees", ROCK_ANGLE, ROCK_DURATION)
+	tween.tween_property(self, "rotation_degrees", -ROCK_ANGLE, ROCK_DURATION)
+	tween.tween_property(self, "rotation_degrees", 0.0, ROCK_DURATION * 0.5)
+	tween.finished.connect(func() -> void: _state = State.IDLE)