fix: Fix navigation links and restore LanguageSwitcher

- Add missing nav keys to types.ts, de.ts, en.ts (sessions, buddies, stats, wishlist)
- Add LanguageSwitcher back to authenticated header
- Create /sessions page with SessionList
- Create /buddies page with BuddyList
- Create /stats page with StatsDashboard
- Create /wishlist placeholder page

src/app/sessions/page.tsx

@@ -0,0 +1,38 @@
+'use client';
+
+import { useRouter } from 'next/navigation';
+import { ArrowLeft, Calendar, Plus } from 'lucide-react';
+import SessionList from '@/components/SessionList';
+import { useI18n } from '@/i18n/I18nContext';
+
+export default function SessionsPage() {
+    const router = useRouter();
+    const { t } = useI18n();
+
+    return (
+        <main className="min-h-screen bg-zinc-950 p-4 pb-24">
+            <div className="max-w-2xl mx-auto">
+                {/* Header */}
+                <div className="flex items-center gap-4 mb-8">
+                    <button
+                        onClick={() => router.back()}
+                        className="p-2 rounded-xl bg-zinc-900 border border-zinc-800 text-zinc-400 hover:text-white hover:border-zinc-700 transition-colors"
+                    >
+                        <ArrowLeft size={20} />
+                    </button>
+                    <div>
+                        <h1 className="text-2xl font-bold text-white">
+                            {t('session.title')}
+                        </h1>
+                        <p className="text-sm text-zinc-500">
+                            Manage your tasting events
+                        </p>
+                    </div>
+                </div>
+
+                {/* Session List */}
+                <SessionList />
+            </div>
+        </main>
+    );
+}