feat(scroller): 双方向仮想無限スクロール

[uni-kakurenbo]

概要

• MessagesScroller の内部実装を Virtua に移植

なぜこの PR を入れたいのか

PR を出す前の確認事項

• （機能の追加なら）追加することの合意がチームで取れている
  • 取れていない場合はチェックを外して PR にすれば OK
• 動作確認ができている
• 自分で一度コードを眺めて自分的に問題はなさそう

[github-actions]

Preview (prod) → https://5024-prod.traq-preview.trapti.tech/
Preview (dev) → https://5024-dev.traq-preview.trapti.tech/

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.72%. Comparing base (377987c) to head (1d75d47).

Files with missing lines	Patch %	Lines
src/lib/notification/notification.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5024      +/-   ##
==========================================
+ Coverage   62.69%   62.72%   +0.02%     
==========================================
  Files         108      108              
  Lines        3091     3093       +2     
  Branches      629      629              
==========================================
+ Hits         1938     1940       +2     
  Misses       1043     1043              
  Partials      110      110              

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