feat: アニメーションの一部実装（#176） (#178)

#176 完了

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #178

frontend/package.json

@@ -19,6 +19,7 @@
     "camelcase-keys": "^9.1.3",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "framer-motion": "^12.23.26",
     "humps": "^2.0.1",
     "lucide-react": "^0.511.0",
     "markdown-it": "^14.1.0",