Fix CI regressions issue

[Kyle-Ye]

Summary

• Disable SwiftPM index-store generation in affected macOS build paths to avoid Swift 6.2 compiler crashes while indexing AppKit with the private framework shims.
• Derive attributed string metric expectations from UIKit font metrics while preserving existing non-UIKit expectations.
• Update DisplayList test expectations to accept the default opacity attribute.

CI status

As of August 4, 2026:

• Passed: iOS, macOS compatibility tests, Ubuntu, Stdout Renderer (Compute), PR Triage, and Codecov.
• In progress: iOS compatibility tests and macOS tests.
• Queued: Stdout Renderer (AttributeGraph).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.08%. Comparing base (84c73d5) to head (4a6c366).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #978       +/-   ##
===========================================
+ Coverage   14.87%   27.08%   +12.21%     
===========================================
  Files         688      731       +43     
  Lines       46885    53573     +6688     
===========================================
+ Hits         6974    14512     +7538     
+ Misses      39911    39061      -850     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenSwiftUI	✅	0 %	82	0	82	e444da323

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	1m 54s	e444da323