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/admin.html

@@ -188,7 +188,6 @@
     </footer>
 
     <!-- Load shared theme utility -->
-    <script src="theme-utils.js"></script>
     <script src="utils.js"></script>
     <script src="admin.js"></script>
 </body>

public/i18n.js

@@ -9,7 +9,6 @@ class I18nService {
     this.defaultLocale = 'en';
     this.availableLocales = ['en', 'es-MX'];
     this.currentLocale = this.getStoredLocale() || this.detectBrowserLocale();
-    this.loadTranslations();
   }
 
   /**

public/index.html

@@ -173,8 +173,6 @@ placeholder="Enter address, intersection (e.g., Main St & Second St, City), or l
     </div>
 
     <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
-    <!-- Load shared theme utility -->
-    <script src="theme-utils.js"></script>
     <script src="utils.js"></script>
     <script src="app-mapbox.js"></script>
     

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);

public/sw.js

@@ -1,5 +1,5 @@
 // Service Worker for Great Lakes Ice Report PWA
-const CACHE_NAME = 'ice-report-v1';
+const CACHE_NAME = 'ice-report-v2';
 const OFFLINE_URL = '/offline.html';
 
 // Files to cache for offline functionality