[Feature] Add Tranparency option to Easyclick and Gridmove background labels.

[Guscccc]

When using Easyclick or Gridmove (especially the latter), labels often block out the UI elements, making it hard to click on the intended targets or navigate the interface efficiently. So i think adding a tranparency setting to the label background will help a lot.

[pit-ray]

Currently, win-vind draws directly on the screen device context rather than in a transparent window, which does not allow for complex displays. Therefore, in the future, an efficient drawing system with transparent windows, such as NVIDIA Geforce Experience, should be adopted.

Pull requests are welcome.