Implement Window.bleed_top on macOS and iOS systems
#4133
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Refs #4039 (implements the first part of @freakboy3742's suggestion, that is "A single boolean for "bleed titlebar". Bleed behavior always applies to whatever axis actually has the titlebar.")
There's some design decisions involved inline that I will document with a comment here once I get the docs and tests straightened up. Some things are macOS 26+ and iOS 26+ specific, so no-covers are likely needed.
PR Checklist: