Turn dev mode into sandbox menu

ui/DevMenuButton.gd

@@ -0,0 +1,75 @@
+extends Control
+
+# Editor-only entry into the live sandbox. The modal scene owns presentation;
+# this small controller owns the boundary to the world nodes it manipulates.
+
+@onready var button: IconButton = $Button
+@onready var menu: Control = get_node("../DevMenu")
+@onready var fleet: Node = get_node("../../Fleet")
+
+
+func _ready() -> void:
+	button.pressed.connect(_on_pressed)
+	menu.fleet_add_requested.connect(_on_fleet_add_requested)
+	menu.fleet_remove_requested.connect(_on_fleet_remove_requested)
+	menu.unlock_skills_requested.connect(_on_unlock_skills_requested)
+	menu.unlimited_resources_requested.connect(_on_unlimited_resources_requested)
+	menu.wave_requested.connect(_on_wave_requested)
+	visible = false
+
+
+func _process(_delta: float) -> void:
+	var show_it: bool = GameState.dev_mode and not GameState.intro_active
+	if show_it != visible:
+		visible = show_it
+	if not show_it and menu.visible:
+		menu.close_menu()
+
+
+func _on_pressed() -> void:
+	if not GameState.dev_mode:
+		return
+	menu.open_for(fleet)
+
+
+func _on_fleet_add_requested(vessel_type: String) -> void:
+	if fleet.add_ship(vessel_type):
+		menu.set_status("Added %s" % GameState.vessel_name(vessel_type))
+	else:
+		menu.set_status("Fleet is full — unlock all skills for up to %d slots" \
+			% GameState.DEFAULT_FORMATION.size())
+
+
+func _on_fleet_remove_requested(vessel_type: String) -> void:
+	var index: int = -1
+	for i in range(fleet.ships.size()):
+		if is_instance_valid(fleet.ships[i]) \
+				and String(fleet.ships[i].vessel_type) == vessel_type:
+			index = i
+			break
+	if index < 0:
+		menu.set_status("No %s is currently deployed" % GameState.vessel_name(vessel_type))
+		return
+	if fleet.store_ship(index) == "":
+		menu.set_status("Keep at least one vessel in the fleet")
+		return
+	menu.set_status("Removed %s" % GameState.vessel_name(vessel_type))
+
+
+func _on_unlock_skills_requested() -> void:
+	var unlocked_count: int = GameState.dev_unlock_all_skills()
+	if unlocked_count > 0:
+		menu.set_status("Unlocked all skills (%d new)" % unlocked_count)
+	else:
+		menu.set_status("All skills are already unlocked")
+
+
+func _on_unlimited_resources_requested(enabled: bool) -> void:
+	if not GameState.set_dev_unlimited_resources(enabled):
+		return
+	menu.set_status("Unlimited resources %s" % ("enabled" if enabled else "disabled"))
+
+
+func _on_wave_requested() -> void:
+	GameState.force_wave_now()
+	menu.close_menu()