Fixes: 1) Replace usage of `vue-router` with `window.location.href` for redirects across multiple composables; 2) Ensure proper locale switching in authentication flows;
Extra: 1) Update `package-lock.json` with dependencies for Apollo, Vue I18n, and styling; 2) Remove unused `i18n.config.js` to streamline i18n setup; 3) General composables refactoring to improve code maintainability;