• `xcconfig` `MACOSX_DEPLOYMENT_TARGET` updated to 13.0
• Removed `@available` annotations for macOS < 13.0
• Removed for Big Sur fixes.
This has been built and doesn’t trigger any build settings should be `xcconfig` options.
Noticed that the window size wasn't returning the new value and that's why using the window size to calculate the size to restore it to we were incrementing the original size by one.
Not sure if this breaks the fix that this bigSurOffsetFix was implementing though because I can't replicate that on macOS 12.4
DetailWebView.setFrameSize() calls bigSurOffsetFix(), which changes the window's frame, which ultimately calls setFrameSize() again (which calls bigSurOffsetFix(), etc). In practice, this isn't causing an infinite loop (I think NSWindow.setFrame(_:display:) is smart enough to prevent reentrancy) but it's still dangerous to have such a glaring logic error in the code.
Move the code that twiddles the window frame from DetailWebView.viewDidEndLiveResize() into a new bigSurOffsetFix() API so it can also be called by setFrameSize() when the frame size is changed outside of a live resize.
