refactor(frontend): prefix css variables (UI)

[kakkokari-gtyih]

What

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 17.85714% with 207 lines in your changes missing coverage. Please review.

Project coverage is 19.37%. Comparing base (a624546) to head (b430239).
Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/ui/classic.vue	0.00%	9 Missing ⚠️
packages/frontend/src/ui/universal.vue	0.00%	9 Missing ⚠️
packages/frontend/src/ui/_common_/navbar.vue	0.00%	8 Missing ⚠️
packages/frontend/src/pages/timeline.vue	0.00%	7 Missing ⚠️
packages/frontend/src/pages/page.vue	0.00%	6 Missing ⚠️
packages/frontend/src/components/MkFolder.vue	0.00%	5 Missing ⚠️
packages/frontend/src/ui/_common_/common.vue	0.00%	5 Missing ⚠️
packages/frontend/src/components/MkPagePreview.vue	0.00%	4 Missing ⚠️
packages/frontend/src/pages/antenna-timeline.vue	0.00%	4 Missing ⚠️
packages/frontend/src/pages/avatar-decorations.vue	0.00%	4 Missing ⚠️
... and 87 more

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14739       +/-   ##
============================================
- Coverage    41.38%   19.37%   -22.01%     
============================================
  Files         1557      721      -836     
  Lines       200808   102316    -98492     
  Branches      3627      992     -2635     
============================================
- Hits         83101    19827    -63274     
+ Misses      117106    81938    -35168     
+ Partials       601      551       -50     

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[syuilo]

単に MI でも良さそう

[kakkokari-gtyih]

単に MI でも良さそう

トップレベルに置いたら他のMI要素とぶつかって後々面倒かなと思ったので

[syuilo]

テーマ以外で使われるCSS変数でUIに関係しないものって(今も未来も)存在しない気がしたからそうするとわざわざUIを付けるのは冗長になる気がした感じ

[kakkokari-gtyih]

テーマ以外で使われるCSS変数でUIに関係しないものって(今も未来も)存在しない気がした

なるほど、もどした

[kakkokari-gtyih]

#14739 (review) #14739 (review) らへんがどういう想定だったかの確認ができたらreadyかも

[kakkokari-gtyih]

カスタムCSSを利用している人が割と多いので、不本意だったとしてもCHANGELOGで言及しておいたほうが親切そう（別に減るもんではないし）

[syuilo]

🙏🏻