Hide Traffic Light Buttons in NSWindow Without Removing Resize Functionality

I noticed that in macOS’s dark mode, a window without a visible title bar won’t draw a light border. It will draw a dark/black border, unlike all the other windows, and thus be a lot less visible than it needs to be. So for a floating helper window, I had to make the title bar visible, and then hide all traffic light buttons in the window’s top-left corner:

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