fix(frontend): 瞬間的にstreamから切断された場合にもstream indicatorが出てしまうのを修正

[kakkokari-gtyih]

What

一瞬切れただけでも出てしまうのはうざい可能性がある
あと再接続されても消えなかったのでそれも修正

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 9 lines in your changes missing coverage. Please review.

Project coverage is 19.39%. Comparing base (db95b6b) to head (1c5503d).

Files with missing lines	Patch %	Lines
...ages/frontend/src/ui/_common_/stream-indicator.vue	0.00%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14832       +/-   ##
============================================
- Coverage    38.37%   19.39%   -18.98%     
============================================
  Files         1557      724      -833     
  Lines       196633   103230    -93403     
  Branches      3308      992     -2316     
============================================
- Hits         75460    20026    -55434     
+ Misses      120563    82653    -37910     
+ Partials       610      551       -59     

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[kakkokari-gtyih]

コンフリクト解消