fix(gesture): prevent layout gesture reset crashes

[Kyle-Ye]

Summary

• Prevent crashes when lazy gesture debug data reads child state during a reset.
• Reset a local child value before writing it back in terminal, reset-seed, and child-removal paths.
• Add regression coverage for all three reset paths and preserved terminal debug snapshots.

Closes #1086

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenSwiftUI	✅	0 %	1225	0	1225	02076d961

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	55.2s	02076d961

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 28.22%. Comparing base (dbd2dfb) to head (d750029).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1085      +/-   ##
==========================================
+ Coverage   28.21%   28.22%   +0.01%     
==========================================
  Files         749      749              
  Lines       55199    55207       +8     
==========================================
+ Hits        15573    15584      +11     
+ Misses      39626    39623       -3     

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