Fix language selector disappearing on navigation

- Remove missing theme-utils.js references from all HTML files
- Fix double initialization in i18n.js causing language selector conflicts
- Update service worker cache version to force fresh file loading
- Language selector now persists when navigating via snowflake icon

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

public/privacy.html

@@ -139,7 +139,6 @@
     </footer>
     
     <!-- Load shared theme utility -->
-    <script src="theme-utils.js"></script>
     <script>
         // Initialize theme when page loads
         document.addEventListener('DOMContentLoaded', initializeTheme);