chore: upgrade to react native 0.85

[mdjastrzebski]

fix: add React Native 0.85 support and update RN CI matrix

Summary

• add support for React Native 0.85 in the root dev setup
• add @react-native/jest-preset for the root package while keeping Jest configured with preset: 'react-native'
• update CI to cover React Native 0.84 and 0.85 explicitly
• bump CI-checked React Native minors to their latest published patch versions
• make the shared setup action install @react-native/jest-preset only for React Native 0.85+ and remove it for older versions

Testing

• yarn install
• yarn typecheck
• yarn prettier --check .github/workflows/ci.yml .github/workflows/nightly.yaml
• yarn prettier --check .github/actions/setup-deps/action.yml
• yarn prettier --check jest.config.js .github/actions/setup-deps/action.yml
• yarn jest --maxWorkers=2 --watchman=false

Notes

• example apps stay on the old Jest preset path
• the shared Jest config uses react-native, which forwards to @react-native/jest-preset on React Native 0.85+

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.30%. Comparing base (3e8bc07) to head (b2016e5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1894   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          79       79           
  Lines        1475     1475           
  Branches      408      408           
=======================================
  Hits         1450     1450           
  Misses         24       24           
  Partials        1        1           

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