feat: add battlepass slider and quest list tabs to lobby HUD

scenes/ui/battlepass_panel.gd

@@ -0,0 +1,13 @@
+extends Panel
+
+@onready var _slider = $Content/ScrollContainer
+@onready var _ticket = $Ticket
+
+
+func _ready() -> void:
+	if _slider.has_signal("page_changed"):
+		_slider.page_changed.connect(_on_page_changed)
+
+
+func _on_page_changed(index: int) -> void:
+	_ticket.show_index(index)