fix(user-event): include selection in TextInput change event

[nsbarsukov]

Summary

React Native (>=0.85) reports the caret position via onChange's nativeEvent.selection (see commits from react-native repo 162627a and c1f5445).

userEvent.type() did not include selection in the change event's nativeEvent — it computed a selectionRange (caret at the end of the current text) and emitted it only via a separate selectionChange event. As a result, components that read the caret from event.nativeEvent.selection inside their onChange handler (e.g. input-masking libraries) could not be driven by userEvent.type(...): they saw no selection, mishandled every keystroke, and the value never updated.

This PR folds the already-computed selectionRange into the change event so it matches the real platform shape, while keeping the separate selectionChange event unchanged.

Changes:

• buildTextChangeEvent(text, selection) now includes selection: { start, end } in the change event's nativeEvent.
• type() (emitTypingEvents) and paste() pass the caret range (end of the current/inserted text) into the change event. clear() inherits this via emitTypingEvents.
• submitEditing / endEditing are left as-is — the platform does not report a selection on those events.

Test plan

• yarn test — all suites pass (snapshots for type, type-managed, paste, and clear regenerated to include selection).
• yarn typecheck, yarn lint, yarn format:check — all pass.
• New/updated unit tests in src/user-event/type/__tests__/type.test.tsx:
  • Asserts that after userEvent.type(input, 'Hello'), the onChange handler receives an event whose nativeEvent.selection equals { start: 5, end: 5 }.
  • Regression test mounting a masking-style TextInput that reads e.nativeEvent.selection in onChange and only updates its value when the caret is present — confirms it is now correctly driven by userEvent.type().
• Updated src/event-builder/__tests__/text.test.ts to assert selection is present in the built change-event payload.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.40%. Comparing base (e5e8e37) to head (08b5fed).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1919   +/-   ##
=======================================
  Coverage   98.40%   98.40%           
=======================================
  Files          79       79           
  Lines        1501     1501           
  Branches      414      398   -16     
=======================================
  Hits         1477     1477           
  Misses         24       24           

☔ 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.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[mdjastrzebski]

@nsbarsukov thank you for spotting this and providing a fix