enhance(frontend): フォロワーへのメッセージ欄を改良

[kakkokari-gtyih]

What

• 吹き出しにする
• 「フォロワーへのメッセージ」であることを明記する

Why

今のままだと何らかの警告表示に見間違えそうなので

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 99.14530% with 1 line in your changes missing coverage. Please review.

Project coverage is 19.52%. Comparing base (a3d236c) to head (e35bc20).
Report is 204 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/components/MkFukidashi.vue	99.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14656       +/-   ##
============================================
- Coverage    41.74%   19.52%   -22.23%     
============================================
  Files         1549      716      -833     
  Lines       196555   101490    -95065     
  Branches      2767      987     -1780     
============================================
- Hits         82055    19815    -62240     
+ Misses      113939    81129    -32810     
+ Partials       561      546       -15     

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[syuilo]

🙏🏻