Add prestige graph

core/prestige/prestige_buff_graph_panel.gd

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+## Separate-screen panel displaying the prestige buff graph.
+## Tiles are placed manually in the scene editor — each PrestigeBuffGraphTile has its PrestigeBuffNode
+## resource assigned directly. The panel manages the prestige currency balance display and
+## delegates connection-line drawing to a PrestigeBuffConnectionOverlay child.
+class_name PrestigeBuffGraphPanel
+extends PanelContainer
+
+@onready var _balance_label: Label = $MarginContainer/VBoxContainer/BalanceLabel
+@onready var _tiles_area: Control = $MarginContainer/VBoxContainer/TilesArea
+@onready var _close_button: Button = $MarginContainer/VBoxContainer/Header/CloseButton
+@onready var _connection_overlay: PrestigeBuffConnectionOverlay = $MarginContainer/VBoxContainer/TilesArea/ConnectionOverlay
+
+var _game_state: LevelGameState
+
+
+func _ready() -> void:
+	_game_state = find_parent("LevelGameState")
+	if _game_state == null:
+		push_error("PrestigeBuffGraphPanel: Could not find LevelGameState parent")
+		return
+
+	_game_state.currency_changed.connect(_on_currency_changed)
+	_close_button.pressed.connect(_on_close_pressed)
+
+	visibility_changed.connect(_on_visibility_changed)
+	_refresh_balance()
+
+
+## Rebuilds the connection overlay by scanning all PrestigeBuffGraphTile children and matching parent_ids.
+func _refresh_connections() -> void:
+	if _connection_overlay == null:
+		return
+
+	var tiles_by_id: Dictionary = {}
+	var all_tiles: Array[PrestigeBuffGraphTile] = []
+	_collect_tiles(_tiles_area, all_tiles)
+
+	for tile in all_tiles:
+		var node_id: StringName = tile.get_node_id()
+		if node_id != &"":
+			tiles_by_id[node_id] = tile
+
+	var connections: Array = []
+	for tile in all_tiles:
+		if tile.prestige_buff == null:
+			continue
+		for parent_id in tile.prestige_buff.parent_ids:
+			var parent_tile: PrestigeBuffGraphTile = tiles_by_id.get(parent_id, null)
+			if parent_tile:
+				connections.append([parent_tile, tile])
+
+	_connection_overlay.set_connections(connections)
+
+
+## Recursively collects all PrestigeBuffGraphTile nodes from a container.
+func _collect_tiles(from: Node, out_tiles: Array[PrestigeBuffGraphTile]) -> void:
+	for child in from.get_children():
+		if child is PrestigeBuffGraphTile:
+			out_tiles.append(child)
+		elif child is Container:
+			_collect_tiles(child, out_tiles)
+
+func _refresh_balance() -> void:
+	if _game_state == null:
+		_balance_label.text = "Prestige Currency: 0"
+		return
+
+	var currency_id: StringName = _game_state.get_prestige_currency_id()
+	var balance: BigNumber = _game_state.get_currency_amount_by_id(currency_id)
+	_balance_label.text = "Prestige Currency: %s" % balance.to_string_suffix(2)
+
+func _on_currency_changed(currency_id: StringName, _new_amount: BigNumber) -> void:
+	if currency_id == _game_state.get_prestige_currency_id():
+		_refresh_balance()
+
+func _on_close_pressed() -> void:
+	hide()
+
+func _on_visibility_changed() -> void:
+	if visible:
+		_refresh_balance()
+		_refresh_connections()
+
+func _on_prestige_buff_toggle_pressed() -> void:
+	show()