Update syncMain implementation

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Refactors Update.syncMain to better match the SwiftUI 6.5.4 synchronization behavior when hopping work onto the main thread.

Changes:

• Replaces the previous @_silgen_name-based MovableLock.syncMain shim with a direct call to the imported MovableLock.syncMain(self:_:function:) entry point.
• Packages the work closure plus relevant state into a small context struct and forwards it through the lock’s sync-main pathway.
• Preserves and restores Subgraph.current around the main-thread execution to keep AttributeGraph state consistent across the thread hop.
• Removes the now-unneeded MovableLock extension that declared the old external symbol.

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[augmentcode]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.81%. Comparing base (4c855cf) to head (38209be).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/OpenSwiftUICore/Data/Update.swift	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #698      +/-   ##
==========================================
- Coverage   28.82%   28.81%   -0.02%     
==========================================
  Files         589      589              
  Lines       35780    35794      +14     
==========================================
  Hits        10314    10314              
- Misses      25466    25480      +14     

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