fix(frontend/frontend-embed): インポートパス・テーマまわりなどの修正

[kakkokari-gtyih]

What

• frontend: テーマのインポートパスの変更漏れを修正
• frontend-embed: iframeを正常に透過させるためにCSSのcolor-schemeをlight darkに固定
• frontend-embed: 一部のconsoleをDEVのみで表示させるように修正
• frontend-embed: サーバーデフォルトのテーマがある場合はそちらを利用するように

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 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 19.76%. Comparing base (2cbe1d1) to head (1dc18fc).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/frontend/src/components/MkEmbedCodeGenDialog.vue	0.00%	1 Missing ⚠️
packages/frontend/src/scripts/theme.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14535       +/-   ##
============================================
- Coverage    41.37%   19.76%   -21.61%     
============================================
  Files         1543      717      -826     
  Lines       196679   100466    -96213     
  Branches      3547     1003     -2544     
============================================
- Hits         81371    19859    -61512     
+ Misses      114714    80063    -34651     
+ Partials       594      544       -50     

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[syuilo]

🙏🏿