feat: singleplayer level selector

ui/pause_menu.gd

@@ -6,6 +6,7 @@ var resume_btn: Button
 var respawn_btn: Button
 var loadouts_btn: Button
 var settings_btn: Button
+var return_btn: Button
 var exit_btn: Button
 
 # Loadout UI
@@ -48,6 +49,7 @@ var rebind_label: Label
 var waiting_for_input_action: String = ""
 
 var quit_dialog: ConfirmationDialog
+var return_dialog: ConfirmationDialog
 
 func _ready() -> void:
 	process_mode = Node.PROCESS_MODE_ALWAYS
@@ -70,6 +72,10 @@ func _input(event: InputEvent) -> void:
 		return
 
 	if event.is_action_pressed("ui_cancel"):
+		# Don't open the pause menu if we are already in the main menu
+		if get_tree().current_scene and get_tree().current_scene.name == "MainMenu":
+			return
+			
 		if visible:
 			_resume()
 		else:
@@ -129,6 +135,11 @@ func _build_ui() -> void:
 	settings_btn.custom_minimum_size = Vector2(200, 50)
 	main_vbox.add_child(settings_btn)
 	
+	return_btn = Button.new()
+	return_btn.text = "Main Menu"
+	return_btn.custom_minimum_size = Vector2(200, 50)
+	main_vbox.add_child(return_btn)
+	
 	exit_btn = Button.new()
 	exit_btn.text = "Exit Game"
 	exit_btn.custom_minimum_size = Vector2(200, 50)
@@ -571,6 +582,12 @@ func _build_ui() -> void:
 	quit_dialog.title = "Quit Game"
 	quit_dialog.dialog_text = "Are you sure you want to close the game?"
 	add_child(quit_dialog)
+	
+	# ── Return Dialog ──
+	return_dialog = ConfirmationDialog.new()
+	return_dialog.title = "Main Menu"
+	return_dialog.dialog_text = "Are you sure you want to return to the main menu?"
+	add_child(return_dialog)
 
 func _build_vol_control(parent: Node, label_name: String) -> Array:
 	var hbox = HBoxContainer.new()
@@ -619,11 +636,20 @@ func _connect_signals() -> void:
 	respawn_btn.pressed.connect(_respawn)
 	loadouts_btn.pressed.connect(_show_loadouts)
 	settings_btn.pressed.connect(_show_settings)
+	return_btn.pressed.connect(_show_return_dialog)
 	exit_btn.pressed.connect(_show_exit_dialog)
 	back_to_main_btn.pressed.connect(_show_main_menu)
 	settings_back_btn.pressed.connect(_show_main_menu)
 	save_loadout_btn.pressed.connect(_save_current_loadout)
 	quit_dialog.confirmed.connect(_quit_game)
+	return_dialog.confirmed.connect(_return_to_main_menu)
+
+func _show_return_dialog() -> void:
+	return_dialog.popup_centered()
+
+func _return_to_main_menu() -> void:
+	_resume() # Reset pause state and cursor mode
+	get_tree().change_scene_to_file("res://ui/main_menu/main_menu.tscn")
 
 func _show_main_menu() -> void:
 	main_vbox.visible = true