Add tooltip component and integrate it into the scene; adjust audio volume for coin sound effect

scripts/components/tooltip_component.gd

@@ -0,0 +1,42 @@
+class_name TooltipComponent
+extends Node
+
+@export var area2d: Area2D
+@export var ui_root: Control
+@export var text: String = ""
+@export var tooltip_label: Label
+
+
+func _ready() -> void:
+	if not area2d:
+		printerr("Tooltip node missing Area2D child.")
+		return
+
+	if not ui_root:
+		printerr("Tooltip node missing UI root child.")
+		return
+
+	if not tooltip_label:
+		printerr("Tooltip node missing tooltip label child.")
+		return
+
+	tooltip_label.text = text
+	ui_root.visible = false
+	area2d.body_entered.connect(_on_area2d_body_entered)
+	area2d.body_exited.connect(_on_area2d_body_exited)
+
+
+func show_tooltip() -> void:
+	ui_root.visible = true
+
+
+func hide_tooltip() -> void:
+	ui_root.visible = false
+
+
+func _on_area2d_body_entered(_body: Node) -> void:
+	show_tooltip()
+
+
+func _on_area2d_body_exited(_body: Node) -> void:
+	hide_tooltip()

scripts/steam_integration.gd

@@ -0,0 +1,13 @@
+class_name SteamIntegration
+extends Node
+
+var app_id: String = "3575090"
+
+
+func _init() -> void:
+	OS.set_environment("STEAM_APP_ID", app_id)
+	OS.set_environment("STEAM_GAME_ID", app_id)
+
+
+func _ready() -> void:
+	pass