fix: Resolve react-scripts-related vulnerability by applying package …

…overrides

- Moved `react-scripts` to `devDependencies` to mitigate dependency conflict with `nth-check`.
- Applied overrides to update `nth-check` to a non-vulnerable version (>=2.0.2).
- Updated `postcss` to match the required version (>=8.4.31) in `react-scripts`.
- Adjusted package-lock.json to remove old references to vulnerable packages.

Ref: facebook/create-react-app#11174

package.json

@@ -52,11 +52,19 @@
         "eslint-plugin-react": "^7.37.0",
         "eslint-plugin-tailwindcss": "^3.17.4",
         "globals": "^15.9.0",
-        "postcss": ">=8.4.31",
+        "postcss": "^8.4.47",
         "prettier": "^3.3.3",
         "prettier-plugin-tailwindcss": "^0.6.8",
         "tailwindcss": "^3.4.13",
         "typescript-eslint": "^8.7.0"
     },
-    "homepage": "http://do0ori.github.io/visual-timer"
+    "homepage": "http://do0ori.github.io/visual-timer",
+    "overrides": {
+        "svgo": {
+            "nth-check": ">=2.0.2"
+        },
+        "react-scripts": {
+            "postcss": ">=8.4.31"
+        }
+    }
 }