➕(frontend) add react-intersection-observer package

- Install `react-intersection-observer` to manage element visibility detection.
- Enables features like lazy loading, animations on scroll, and triggering
events when elements appear in the viewport.

src/frontend/apps/impress/package.json

@@ -34,6 +34,7 @@
     "react-aria-components": "1.5.0",
     "react-dom": "*",
     "react-i18next": "15.4.0",
+    "react-intersection-observer": "9.13.1",
     "react-select": "5.9.0",
     "styled-components": "6.1.13",
     "y-protocols": "1.0.6",