fix: keep auto-sized carousel responsive after resize

[dohooo]

Summary

• keep the rendered main axis at 100% when carousel sizing comes from automatic layout measurement
• preserve explicit page-size behavior while avoiding the first measured width locking the container after mount
• add issue Carousel V5 doesn't resize automatically after changing the window size #890 regressions that verify repeated onLayout updates keep size sync and rescale offset behavior

Root cause

CarouselLayout was using resolvedSize to drive the rendered container width in auto-size mode. After the first onLayout, that switched the horizontal main axis from 100% to a fixed pixel width, so later window or parent layout resizes no longer propagated naturally.

Verification

• yarn test --runInBand src/components/Carousel.test.tsx -t "issue #890"
• yarn test --runInBand src/components/Carousel.test.tsx src/hooks/useCommonVariables.test.tsx
• yarn types

Closes #890.

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Project	Deployment	Actions	Updated (UTC)
react-native-reanimated-carousel	Ready	Preview, Comment	Mar 30, 2026 8:30am

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.78%. Comparing base (fec99d7) to head (aa92a2d).

Files with missing lines	Patch %	Lines
src/components/CarouselLayout.tsx	77.77%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #908      +/-   ##
==========================================
+ Coverage   84.32%   84.78%   +0.45%     
==========================================
  Files          37       37              
  Lines        1040     1045       +5     
  Branches      362      365       +3     
==========================================
+ Hits          877      886       +9     
+ Misses         67       66       -1     
+ Partials       96       93       -3     

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