Fix: Parent portal language selector as dropdown instead of onboarding redirect

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

studio-v2/app/parent/page.tsx

@@ -4,6 +4,7 @@ import React, { useState, useEffect } from 'react'
 import Link from 'next/link'
 import { useTheme } from '@/lib/ThemeContext'
 import { useLanguage } from '@/lib/LanguageContext'
+import type { Language } from '@/lib/i18n'
 
 interface LearningUnit {
   id: string
@@ -60,9 +61,19 @@ export default function ParentPage() {
                 {t('greeting')}
               </p>
             </div>
-            <Link href="/onboarding" className={`text-sm px-3 py-1.5 rounded-lg ${isDark ? 'bg-white/10 text-white/60' : 'bg-slate-100 text-slate-500'}`}>
-              {language.toUpperCase()}
-            </Link>
+            <select
+              value={language}
+              onChange={(e) => setLanguage(e.target.value as Language)}
+              className={`text-sm px-2 py-1.5 rounded-lg border-0 ${isDark ? 'bg-white/10 text-white/60' : 'bg-slate-100 text-slate-500'}`}
+            >
+              <option value="de">DE</option>
+              <option value="tr">TR</option>
+              <option value="ar">AR</option>
+              <option value="uk">UK</option>
+              <option value="ru">RU</option>
+              <option value="pl">PL</option>
+              <option value="en">EN</option>
+            </select>
           </div>
         </div>
       </div>