Style Layout Controls on Windows to better align with Window Controls Style

[wmentha]

PR Summary

Styles the layout controls on the top-right corner of the Windows client window to better match window control buttons (Minimize/Maximize/Restore Down/Close).

PR Context

This changes the Windows Client (non-web) version's titlebar to be more inline with Windows style guidelines for titlebars as their dimensions are flush with the windows control buttons. This can be seen on other Microsoft apps such as Outlook for the Ribbon Display Options button:

In #138350 @sbatten noted:

I don't think we want this button to look like it's a native window control.

However, I believe the extra height that takes up the entire titlebar's height improves usability. Currently when the window is maximized, moving your cursor to the very top of the windows will not hover over the layout controls when above them which feels imprecise.

I chose a width of 35px for the layout controls as I thought that was an appropriate size.

Demonstration

[sbatten]

@wmentha Thanks for your contribution. I don't think the matter is quite settled yet, but I do think we can address one of the issues you call out, which is the ability to trigger the controls from the top of the screen. We solved this issue with the menubar styling as well. @daviddossett what do you think?

[daviddossett]

While I agree that the hit area for layout controls and command center controls (at least the back/forward buttons) should fill the entire height like we've done for the menubar, I don't think we should follow the Windows background styling given that the rest of the title bar elements (menu bar, command center, layout controls, etc.) share the same styling across platforms.

Here's the menu bar hover behavior today. The hovering anywhere on the title bar will trigger the hover, even above or below the visible background color here:

[wmentha]

@daviddossett The changes for the dimensions of the layout controls have only been changed for Windows to be flush with the system caption buttons like in other Windows applications. However if consistency is key, the style can be reset and I can investigate changing the hit area for them instead to fill the titlebar. Just thought the visual feedback of the hover aligning with the hit area for them was nicer.