enhance(frontend): ブラウザのコンテキストメニューを使用できるように

[kakkokari-gtyih]

What

Fix #7087 → Misskeyのコンテキストメニューを完全無効化できるように
Fix #7078 → 両方のメニューを出せる設定（Shift＋右クリックでMisskeyコンテキストメニュー）

Why

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 5.00000% with 19 lines in your changes missing coverage. Please review.

Project coverage is 20.25%. Comparing base (6793185) to head (1f9d8e0).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
packages/frontend/src/pages/settings/general.vue	0.00%	8 Missing ⚠️
packages/frontend/src/os.ts	12.50%	7 Missing ⚠️
packages/frontend/src/store.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #14076      +/-   ##
===========================================
- Coverage    20.25%   20.25%   -0.01%     
===========================================
  Files          697      697              
  Lines        97737    97757      +20     
  Branches      1014     1014              
===========================================
+ Hits         19796    19797       +1     
- Misses       77421    77440      +19     
  Partials       520      520              

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[kakkokari-gtyih]

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[kakkokari-gtyih]

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