feat: board screen, thinking status

scripts/thinking.gd

@@ -0,0 +1,10 @@
+extends Label
+
+@export var hue = 0.0
+
+func _process(delta):
+	modulate = Color.from_hsv(hue, 1.0, 1.0, 1.0)
+	if hue < 1.0:
+		hue += 0.1 * delta
+	else:
+		hue = 0.0