feat: 빈 일정 UI 기능 구현

Author: gihwan-dev

package.json

@@ -50,6 +50,7 @@
     "@testing-library/react": "^15.0.5",
     "@testing-library/user-event": "^14.5.2",
     "@types/node": "^20.12.7",
+    "@types/randomcolor": "^0.5.9",
     "@types/react": "^18.2.66",
     "@types/react-dom": "^18.2.22",
     "@typescript-eslint/eslint-plugin": "^7.2.0",