fix: default to Spanish by removing navigator from language detection

Browser navigator locale (en-US etc.) was winning over fallbackLng 'es'.
Now only localStorage is checked — first-time visitors get Spanish,
returning visitors get their saved preference from the language picker.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/i18n/i18n.ts

@@ -19,7 +19,7 @@ i18n.use(LanguageDetector)
         fallbackLng: 'es',
         debug: false,
         detection: {
-            order: ['localStorage', 'navigator', 'htmlTag'],
+            order: ['localStorage'],
             caches: ['localStorage'],
             lookupLocalStorage: 'paste-language',
         },