style(ui): request that all types defined

- check in more restrictive mode = request types
- define main types in static/js/core/types.js

static/js/features/auth/auth.js

@@ -405,7 +405,7 @@ function initLanguageSelector() {
     const pickerName = document.getElementById('lang-picker-name');
     const searchInput = document.getElementById('lang-picker-search-input');
 
-    if (!languagePanel || !picker) return;
+    if (!languagePanel || !picker || !pickerFlag || !pickerName || !pickerList) return;
 
     // --- Auto-detect browser language ---
     const detected = detectBrowserLanguage();