Refactor ESLint configuration and update code formatting: Standardize quotes in eslint.config.mjs, next.config.js, and various TypeScript files for consistency. Add Prettier as a dependency and include formatting scripts in package.json. Clean up unnecessary whitespace in multiple files to enhance code readability.

postcss.config.js

@@ -3,5 +3,4 @@ module.exports = {
     tailwindcss: {},
     autoprefixer: {},
   },
-}
-
+};