refactor: rewrite fireEvent tests

[mdjastrzebski]

Summary

Refactors fire-event.test.tsx for better organization and coverage.

Changes:

• Reorganized tests: common → edge cases
• Flattened structure (max 1 nesting level)
• Merged fire-event-textInput.test.tsx into main test file

Test plan

• All tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.74%. Comparing base (ae8f3d8) to head (34df811).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1861      +/-   ##
==========================================
- Coverage   95.83%   95.74%   -0.09%     
==========================================
  Files          80       79       -1     
  Lines        1463     1457       -6     
  Branches      405      384      -21     
==========================================
- Hits         1402     1395       -7     
- Misses         60       61       +1     
  Partials        1        1              

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