feat(home-button): add HomeButton component for hospital/garden navigation

scenes/objects/HomeButton.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://cozypaw_homebtn"]
+
+[ext_resource type="Script" path="res://scripts/objects/home_button.gd" id="1_homebtn"]
+
+[node name="HomeButton" type="Node2D"]
+script = ExtResource("1_homebtn")
+
+[node name="ButtonBody" type="ColorRect" parent="."]
+offset_left = -32.0
+offset_top = -32.0
+offset_right = 32.0
+offset_bottom = 32.0
+color = Color(0.36, 0.70, 0.44, 1)
+
+[node name="ButtonIcon" type="ColorRect" parent="."]
+offset_left = -12.0
+offset_top = -18.0
+offset_right = 12.0
+offset_bottom = 6.0
+color = Color(0.90, 0.88, 0.70, 1)

scripts/objects/home_button.gd

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+## HomeButton — tappable button that navigates between the hospital and the garden area.
+class_name HomeButton extends Node2D
+
+const BUTTON_HALF_SIZE: float = 32.0
+
+@export var go_to_garden: bool = true
+
+
+func _input(event: InputEvent) -> void:
+	if not event is InputEventScreenTouch:
+		return
+	if not (event as InputEventScreenTouch).pressed:
+		return
+	var touch_pos: Vector2 = (event as InputEventScreenTouch).position
+	var local: Vector2 = to_local(touch_pos)
+	if abs(local.x) > BUTTON_HALF_SIZE or abs(local.y) > BUTTON_HALF_SIZE:
+		return
+	if go_to_garden:
+		RoomNavigator.go_to_home()
+	else:
+		RoomNavigator.go_to_hospital()