add testing module; integrate holographic effects into vial_fill shader with noise texture, sum-of-sines water surface, top-down lighting, foam line, and font outlines for readability

scenes/dashboard.gd

@@ -31,6 +31,10 @@ func _add_modules() -> void:
 	grid.place_module(mem, 1, 0)
 	_modules.append(mem)
 
+	var test := preload("res://panels/testing/testing_module.tscn").instantiate()
+	grid.place_module(test, 2, 0)
+	_modules.append(test)
+
 	var timer := Timer.new()
 	timer.timeout.connect(_refresh_modules)
 	timer.autostart = true