enhance(frontend): 投稿フォームの絵文字ピッカーに独立したウィンドウを使用できるように

[kakkokari-gtyih]

What

絵文字ピッカーのスタイルの一つとして「ウィンドウ」を復活

• 投稿フォームを閉じたり、投稿フォームを含むページから離脱したりしたら絵文字ピッカーウィンドウを自動で閉じるように
• 絵文字ピッカーウィンドウは一つしか開けない

Why

Fix #15290

Additional info (optional)

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

Attention: Patch coverage is 17.75148% with 139 lines in your changes missing coverage. Please review.

Project coverage is 18.87%. Comparing base (68175bc) to head (b4935ea).

Files with missing lines	Patch %	Lines
...es/frontend/src/components/MkEmojiPickerWindow.vue	0.00%	71 Missing and 1 partial ⚠️
packages/frontend/src/scripts/emoji-picker.ts	12.50%	49 Missing ⚠️
...kages/frontend/src/pages/settings/emoji-picker.vue	0.00%	9 Missing ⚠️
...src/components/MkEmojiPickerWindow.stories.impl.ts	0.00%	6 Missing and 1 partial ⚠️
packages/frontend/src/store.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #15291       +/-   ##
============================================
- Coverage    37.76%   18.87%   -18.89%     
============================================
  Files         1601      764      -837     
  Lines       203886   110766    -93120     
  Branches      3711     1233     -2478     
============================================
- Hits         76988    20911    -56077     
+ Misses      126256    89268    -36988     
+ Partials       642      587       -55     

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[kakkokari-gtyih]

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