enhance(frontend): 投稿フォームでEscキーが押されたときIME入力中ならダイアログは閉じない

[yuba]

What

投稿フォームMkPostFormの入力エリア（通常入力エリアとCW入力エリア）でEscキーが押されたとき、
IME変換セッション中ならばフォームを閉じないようにします。

#10866 を実現します。

Why

打ち込みかけの日本語入力をEscキーで解除する操作はよくありますが、
それでダイアログまで閉じてしまうのはユーザーの意図ではないため。

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.34%. Comparing base (bc0c53b) to head (18da063).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #14787      +/-   ##
===========================================
- Coverage    19.52%   19.34%   -0.18%     
===========================================
  Files          722      722              
  Lines       102507   102515       +8     
  Branches       990      992       +2     
===========================================
- Hits         20015    19833     -182     
- Misses       81943    82131     +188     
- Partials       549      551       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[yuba]

resolved confliction.

[syuilo]

🙏🏻