feat: implement LayoutGesture

[Kyle-Ye]

Summary

• Implement LayoutGesture child management, event routing, and rebinding while preserving gesture identity across child reordering.
• Combine child phases and preferences, reset completed gestures, and retain their debug output.
• Add regression coverage and shared AIGC tags for related test suites, with test-authoring guidance.

Validation

• The focused macOS LayoutGesture suite passed all 11 tests, including 15 phase-merging cases, before the test metadata updates.
• The final test metadata and skill updates pass Swift syntax parsing, skill validation, and whitespace checks.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenSwiftUI	✅	0 %	1209	0	1209	b6f7d8dee

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	42.9s	b6f7d8dee

[codecov]

Codecov Report

❌ Patch coverage is 96.52510% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.11%. Comparing base (80d9c2b) to head (c10b9b4).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../OpenSwiftUICore/Event/Gesture/LayoutGesture.swift	96.44%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1079      +/-   ##
==========================================
+ Coverage   29.64%   30.11%   +0.47%     
==========================================
  Files         802      802              
  Lines       63285    63538     +253     
==========================================
+ Hits        18758    19133     +375     
+ Misses      44527    44405     -122     

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