add following_ui closing

scripts/ui/following_ui.gd

@@ -2,10 +2,14 @@ extends Control
 class_name FollowingUi
 
 var target: Node3D
+var is_mouse_over: bool = false
 
 @onready var camera: Camera3D = get_viewport().get_camera_3d()
+@onready var panel: Panel = $Panel
 
 func _ready() -> void:
+	assert(camera != null, "camera missing!")
+	assert(panel != null, "panel missing!")
 	visible = false
 
 
@@ -17,10 +21,33 @@ func _process(_delta: float) -> void:
 	position = pos
 
 
-func set_target(to: Node3D)->void:
+func _input(event: InputEvent) -> void:
+	if not visible:
+		return
+
+	if event is InputEventMouseButton and not is_mouse_over:
+		var button_event := event as InputEventMouseButton
+		if not button_event.pressed:
+			return
+		if (
+				button_event.button_index == MOUSE_BUTTON_RIGHT
+				or button_event.button_index == MOUSE_BUTTON_LEFT
+		):
+			close()
+
+	if event is InputEventMouseMotion:
+		var motion_event := event as InputEventMouseMotion
+		is_mouse_over = (
+				Rect2(panel.global_position, panel.size)
+				.has_point(motion_event.position)
+		)
+
+
+func set_target(to: Node3D) -> void:
 	visible = true
 	target = to
 
+
 func close() -> void:
-	visible = true
+	visible = false
 	target = null