[FIX] 라이브 공유 재연결 소진 안내 및 탭 복귀 재동기화 - #501

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Replace `shouldSkipSentryEvent(new·Error('Request·was·aborted·by·server'))).toBe(⏎······false,⏎····` with `⏎······shouldSkipSentryEvent(new·Error('Request·was·aborted·by·server')),⏎····).toBe(false`