feat(ambulance): add Ambulance component with drive-in/out animation triggered by room navigation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scenes/objects/Ambulance.tscn

@@ -0,0 +1,41 @@
+[gd_scene load_steps=2 format=3 uid="uid://cozypaw_ambulance"]
+
+[ext_resource type="Script" path="res://scripts/objects/ambulance.gd" id="1_ambulance"]
+
+[node name="Ambulance" type="Node2D"]
+script = ExtResource("1_ambulance")
+
+[node name="Body" type="ColorRect" parent="."]
+color = Color(1.0, 1.0, 1.0, 1)
+size = Vector2(180, 100)
+position = Vector2(-90, -50)
+
+[node name="RedStripe" type="ColorRect" parent="."]
+color = Color(0.90, 0.15, 0.15, 1)
+size = Vector2(180, 20)
+position = Vector2(-90, -15)
+
+[node name="Cabin" type="ColorRect" parent="."]
+color = Color(0.82, 0.85, 0.90, 1)
+size = Vector2(70, 60)
+position = Vector2(-90, -50)
+
+[node name="WindowFront" type="ColorRect" parent="."]
+color = Color(0.60, 0.85, 1.0, 1)
+size = Vector2(50, 38)
+position = Vector2(-82, -46)
+
+[node name="WheelFront" type="ColorRect" parent="."]
+color = Color(0.15, 0.15, 0.15, 1)
+size = Vector2(30, 30)
+position = Vector2(-75, 48)
+
+[node name="WheelBack" type="ColorRect" parent="."]
+color = Color(0.15, 0.15, 0.15, 1)
+size = Vector2(30, 30)
+position = Vector2(50, 48)
+
+[node name="Siren" type="ColorRect" parent="."]
+color = Color(0.10, 0.40, 1.0, 1)
+size = Vector2(40, 18)
+position = Vector2(-20, -68)

scripts/objects/ambulance.gd

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+## Ambulance — drives in from off-screen right when Emergency Room is entered; tap to toggle.
+class_name Ambulance extends Node2D
+
+const OFFSCREEN_OFFSET: float = 1200.0
+const BUTTON_HALF_WIDTH: float = 90.0
+const BUTTON_HALF_HEIGHT: float = 50.0
+const DRIVE_DURATION: float = 1.2
+
+@export var trigger_floor: int = 0
+@export var trigger_room: int = 3
+
+var _parked_x: float = 0.0
+var _is_parked: bool = false
+var _is_animating: bool = false
+
+
+func _ready() -> void:
+	_parked_x = position.x
+	position.x = _parked_x + OFFSCREEN_OFFSET
+	RoomNavigator.room_changed.connect(_on_room_changed)
+
+
+func _exit_tree() -> void:
+	if RoomNavigator.room_changed.is_connected(_on_room_changed):
+		RoomNavigator.room_changed.disconnect(_on_room_changed)
+
+
+func _on_room_changed(floor_index: int, room_index: int) -> void:
+	if floor_index == trigger_floor and room_index == trigger_room:
+		if not _is_parked and not _is_animating:
+			_drive_in()
+
+
+func _input(event: InputEvent) -> void:
+	if _is_animating:
+		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_WIDTH and abs(local_pos.y) <= BUTTON_HALF_HEIGHT:
+		if _is_parked:
+			_drive_out()
+		else:
+			_drive_in()
+
+
+func _drive_in() -> void:
+	_is_animating = true
+	_is_parked = false
+	var tween: Tween = create_tween()
+	tween.set_ease(Tween.EASE_OUT)
+	tween.set_trans(Tween.TRANS_QUAD)
+	tween.tween_property(self, "position:x", _parked_x, DRIVE_DURATION)
+	tween.finished.connect(func() -> void:
+		_is_parked = true
+		_is_animating = false
+		_play_stop_bounce()
+	)
+
+
+func _drive_out() -> void:
+	_is_animating = true
+	_is_parked = false
+	var tween: Tween = create_tween()
+	tween.set_ease(Tween.EASE_IN)
+	tween.set_trans(Tween.TRANS_QUAD)
+	tween.tween_property(self, "position:x", _parked_x + OFFSCREEN_OFFSET, DRIVE_DURATION)
+	tween.finished.connect(func() -> void:
+		_is_animating = false
+	)
+
+
+func _play_stop_bounce() -> void:
+	var tween: Tween = create_tween()
+	tween.tween_property(self, "scale", Vector2(1.08, 0.94), 0.08)
+	tween.tween_property(self, "scale", Vector2(0.96, 1.06), 0.08)
+	tween.tween_property(self, "scale", Vector2(1.0, 1.0), 0.08)