fix(frontend): serverContextの型エラーを修正

[kakkokari-gtyih]

What

• frontend側のserverContextで返るuser型はfrontend-embedとは違いUserDetailedなので修正
• getServerContextを使うと出る謎の型エラーを修正（内部的にassertServerContextを使うとかでも駄目だったので本当に謎。frontend-embedと実装方法を合わせる(現場でassertする)とエラーは出なくなった）

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 15 lines in your changes missing coverage. Please review.

Project coverage is 19.20%. Comparing base (dac3b1f) to head (9a4c60c).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/server-context.ts	0.00%	5 Missing ⚠️
packages/frontend/src/pages/note.vue	0.00%	4 Missing ⚠️
packages/frontend/src/pages/clip.vue	0.00%	3 Missing ⚠️
packages/frontend/src/pages/user/index.vue	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #15131       +/-   ##
============================================
- Coverage    38.91%   19.20%   -19.72%     
============================================
  Files         1563      728      -835     
  Lines       197745   103810    -93935     
  Branches      3330      992     -2338     
============================================
- Hits         76960    19940    -57020     
+ Misses      120174    83315    -36859     
+ Partials       611      555       -56     

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[syuilo]

🙏