Add generator buffs (additional test required)

generator_buff_tile.gd

@@ -0,0 +1,48 @@
+class_name GeneratorBuffTile
+extends HBoxContainer
+
+signal buy_pressed(buff_id: StringName)
+
+@onready var _icon: TextureRect = $Icon
+@onready var _text_label: Label = $TextLabel
+@onready var _level_label: Label = $LevelLabel
+@onready var _effect_label: Label = $EffectLabel
+@onready var _cost_label: Label = $CostLabel
+@onready var _buy_button: Button = $BuyButton
+
+var _buff_id: StringName = &""
+
+func set_buff(buff: GeneratorBuffData) -> void:
+	if buff == null:
+		_buff_id = &""
+		_icon.texture = null
+		_icon.visible = false
+		_text_label.text = "Unknown Buff"
+		return
+
+	var buff_id_text: String = String(buff.id).strip_edges()
+	_buff_id = StringName(buff_id_text)
+
+	_icon.texture = buff.icon
+	_icon.visible = buff.icon != null
+	_text_label.text = buff.text if not buff.text.strip_edges().is_empty() else buff_id_text
+
+func set_runtime(level: int, effect_text: String, cost_text: String, can_buy: bool, is_maxed: bool) -> void:
+	_level_label.text = "Lv %d" % maxi(level, 0)
+	_effect_label.text = effect_text
+
+	if is_maxed:
+		_cost_label.text = "Max level"
+		_buy_button.text = "Max"
+		_buy_button.disabled = true
+		return
+
+	_cost_label.text = cost_text
+	_buy_button.text = "Buy"
+	_buy_button.disabled = not can_buy
+
+func _on_buy_button_pressed() -> void:
+	if _buff_id == &"":
+		return
+
+	buy_pressed.emit(_buff_id)