enhance(frontend): 外部アプリ認証画面の改良

[kakkokari-gtyih]

What

• 端末に存在するどのアカウントでも認証できるように
• 認証画面でどのアカウントで認証しようとしているのか確認できるように

Why

Fix #14827

Additional info (optional)

アプリ認証は処理がMiAuth/OAuthと全く違う＋既に非推奨扱いなので改修対象外

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 1.33531% with 665 lines in your changes missing coverage. Please review.

Project coverage is 19.21%. Comparing base (15ae160) to head (e867b4c).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/components/MkAuthConfirm.vue	0.00%	449 Missing and 1 partial ⚠️
packages/frontend/src/pages/miauth.vue	0.00%	76 Missing ⚠️
packages/frontend/src/pages/oauth.vue	0.00%	71 Missing ⚠️
packages/frontend/src/account.ts	8.33%	44 Missing ⚠️
...ackages/frontend/src/components/MkSignupDialog.vue	0.00%	8 Missing ⚠️
packages/frontend/src/pages/settings/accounts.vue	0.00%	8 Missing ⚠️
...ntend/src/components/MkAuthConfirm.stories.impl.ts	0.00%	6 Missing and 1 partial ⚠️
packages/frontend/src/_boot_.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14828       +/-   ##
============================================
- Coverage    39.65%   19.21%   -20.44%     
============================================
  Files         1555      724      -831     
  Lines       196110   103222    -92888     
  Branches      3636      994     -2642     
============================================
- Hits         77765    19836    -57929     
+ Misses      117743    82833    -34910     
+ Partials       602      553       -49     

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[syuilo]

👍🏻