feat: AtchaV2 Phase 10 — LA 라이프사이클 + 화면 (수명 연동 + 긴급도 색 + dismiss 감지) - #348

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