fix: Resolve Vue i18n deepCopy crash causing web interface failures

Fixes web interface crashes when clients connect/disconnect by resolving
Vue i18n deepCopy function errors during locale merging operations.

Changes:
- Disable experimental locale detector to prevent SSR locale switching
- Add silentTranslationWarn/silentFallbackWarn to prevent crash-causing warnings
- Enable mergeFallbackMessage for safer locale merging without deep copying
- Disable lazy loading to prevent runtime locale merging issues
- Add fallbackLocale and redirectOn configs for safer browser detection

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

Co-Authored-By: Claude <[email protected]>

src/i18n/i18n.config.ts

@@ -17,6 +17,11 @@ import id from './locales/id.json';
 export default defineI18nConfig(() => ({
   legacy: false,
   fallbackLocale: 'en',
+  // Disable strict mode to prevent deepCopy errors with locale merging
+  silentTranslationWarn: true,
+  silentFallbackWarn: true,
+  // Use shallow merging to avoid deepCopy issues
+  mergeFallbackMessage: true,
   messages: {
     en,
     pl,

src/nuxt.config.ts

@@ -23,9 +23,10 @@ export default defineNuxtConfig({
   },
   i18n: {
     // https://i18n.nuxtjs.org/docs/guide/server-side-translations
-    experimental: {
-      localeDetector: './localeDetector.ts',
-    },
+    // Disabled experimental locale detector to prevent deepCopy errors
+    // experimental: {
+    //   localeDetector: './localeDetector.ts',
+    // },
     // https://wg-easy.github.io/wg-easy/latest/contributing/translation/
     locales: [
       {
@@ -109,7 +110,12 @@ export default defineNuxtConfig({
     strategy: 'no_prefix',
     detectBrowserLanguage: {
       useCookie: true,
+      fallbackLocale: 'en',
+      // Disable redirect to prevent locale switching during SSR
+      redirectOn: 'root',
     },
+    // Disable lazy loading to prevent runtime locale merging issues
+    lazy: false,
   },
   nitro: {
     esbuild: {