share-target API のテキストが下書きで上書きされるバグを修正

[Nagarei]

close #4430
VirtualChannelIdに対してはmessageInputStateStoreを使わないようにした

vueもtypescriptもjavascriptも書いたことのないので悪い書き方かもしれないです。適宜修正してください。

[github-actions]

Preview (prod) → https://4431-prod.traq-preview.trapti.tech/
Preview (dev) → https://4431-dev.traq-preview.trapti.tech/

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 9.26%. Comparing base (8541fd6) to head (5369b3b).
Report is 207 commits behind head on master.

Files with missing lines	Patch %	Lines
src/store/ui/messageInputStateStore.ts	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #4431       +/-   ##
==========================================
- Coverage   86.41%   9.26%   -77.15%     
==========================================
  Files          66     650      +584     
  Lines        4747   28005    +23258     
  Branches      503     521       +18     
==========================================
- Hits         4102    2595     -1507     
- Misses        639   25404    +24765     
  Partials        6       6               

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