UIインスペクターでコンポーネントの表示・非表示がわかるようにする

[FineArchs]

What

UIインスペクターのコンポーネント一覧のうち、画面に映っていない（rootコンポーネントに繋がっていない）ものをグレー表示させるようにします。

misskey-insp-shown.mp4

Why

デバッグにおける利便性のため

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 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 19.43%. Comparing base (d8a2eeb) to head (9fbd25e).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/pages/scratchpad.vue	0.00%	19 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14639       +/-   ##
============================================
- Coverage    41.28%   19.43%   -21.85%     
============================================
  Files         1548      715      -833     
  Lines       199120   101261    -97859     
  Branches      2604      986     -1618     
============================================
- Hits         82202    19680    -62522     
+ Misses      116353    81035    -35318     
+ Partials       565      546       -19     

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[syuilo]

👍🏿