Update ViewGraph.NextUpdate

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR updates how ViewGraph.NextUpdate computes its effective update interval to better match the audited 6.5.4 behavior.

Changes:

• Adds internal tracking (_defaultIntervalWasRequested) to distinguish “default interval requested” from an explicitly chosen interval.
• Adjusts interval(_:reason:) and maxVelocity(_:) so that when a default interval is requested, the graph won’t end up selecting a slower-than-60Hz interval.
• Expands unit tests to cover maxVelocity thresholds and interval/reason behavior.

Technical Notes: Default intervals are represented internally as .infinity and exposed as 0 via interval, aligning with downstream usage (e.g., CAFrameRateRange(interval:) treating 0 as .default).

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[augmentcode]

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[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 28.82%. Comparing base (2b3441a) to head (f35a896).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/OpenSwiftUICore/View/Graph/ViewGraph.swift	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #697      +/-   ##
==========================================
+ Coverage   28.77%   28.82%   +0.04%     
==========================================
  Files         589      589              
  Lines       35775    35780       +5     
==========================================
+ Hits        10295    10313      +18     
+ Misses      25480    25467      -13     

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