Add test cases to track safeAreaPadding and GeometryReader safe area issues

[Kyle-Ye]

Summary

Adds test cases to track known visual rendering differences between OpenSwiftUI and SwiftUI for safe area handling: #511 and #474

Changes

• Added InsetViewModifierUITests.swift in UI tests to track safeAreaPadding rendering differences
• Added GeometryReaderSafeAreaUITests.swift in UI tests to track GeometryReader safe area behavio
  r
  Both tests use withKnownIssue and .bug() tracking API to properly document expected failures
  Tests pass with SwiftUI (reference behavior) and fail with known issues in OpenSwiftUI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 24.57%. Comparing base (9efeb5c) to head (8dd1952).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #512      +/-   ##
==========================================
- Coverage   24.58%   24.57%   -0.02%     
==========================================
  Files         485      485              
  Lines       28105    28105              
==========================================
- Hits         6909     6906       -3     
- Misses      21196    21199       +3     

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