2.5.1

Fix self-sizing sheet layout reentry reported on iPhone Duo.

• Prevent content measurement from synchronously reentering the sheet's layout.
• Preserve animated size changes and completion callbacks when updates are requested during layout.

This release applies the fix from #73 directly on top of 2.5.0, retaining the 2.x API and dependency configuration.

Verified with all 19 package tests on iPhone 18 Pro and iPhone Duo, plus Duo fold, rotation, and software keyboard checks in an isolated hosting app.

Full Changelog: 2.5.0...2.5.1