feat: Add EU cookie banner and user settings page

Cookie Banner:
- GDPR-compliant consent banner
- Shows on first visit, stores consent in localStorage
- Two options: Accept All / Only Essential
- Dark theme with smooth animations

Settings Page (/settings):
- Profile form: display name editing
- Password change with validation
- Cookie settings info section
- Privacy links and account info

New files:
- src/hooks/useCookieConsent.ts
- src/components/CookieBanner.tsx
- src/components/ProfileForm.tsx
- src/components/PasswordChangeForm.tsx
- src/services/profile-actions.ts
- src/app/settings/page.tsx

src/app/settings/page.tsx

@@ -0,0 +1,107 @@
+import { redirect } from 'next/navigation';
+import { createClient } from '@/lib/supabase/server';
+import { getProfile } from '@/services/profile-actions';
+import ProfileForm from '@/components/ProfileForm';
+import PasswordChangeForm from '@/components/PasswordChangeForm';
+import { ArrowLeft, Settings, Cookie, Shield } from 'lucide-react';
+import Link from 'next/link';
+
+export const metadata = {
+    title: 'Einstellungen',
+};
+
+export default async function SettingsPage() {
+    const supabase = await createClient();
+    const { data: { user } } = await supabase.auth.getUser();
+
+    if (!user) {
+        redirect('/login');
+    }
+
+    const profile = await getProfile();
+
+    return (
+        <div className="min-h-screen bg-zinc-950">
+            {/* Header */}
+            <header className="sticky top-0 z-40 bg-zinc-950/80 backdrop-blur-lg border-b border-zinc-800">
+                <div className="max-w-2xl mx-auto px-4 py-4 flex items-center gap-4">
+                    <Link
+                        href="/"
+                        className="p-2 -ml-2 text-zinc-400 hover:text-white transition-colors"
+                    >
+                        <ArrowLeft size={20} />
+                    </Link>
+                    <div className="flex items-center gap-2">
+                        <Settings size={20} className="text-orange-500" />
+                        <h1 className="text-lg font-bold text-white">Einstellungen</h1>
+                    </div>
+                </div>
+            </header>
+
+            {/* Content */}
+            <main className="max-w-2xl mx-auto px-4 py-6 space-y-6">
+                {/* Profile Form */}
+                <ProfileForm
+                    initialData={{
+                        email: profile?.email,
+                        display_name: profile?.display_name,
+                    }}
+                />
+
+                {/* Password Change Form */}
+                <PasswordChangeForm />
+
+                {/* Cookie Settings */}
+                <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
+                    <h2 className="text-lg font-bold text-white mb-4 flex items-center gap-2">
+                        <Cookie size={20} className="text-orange-500" />
+                        Cookie-Einstellungen
+                    </h2>
+                    <p className="text-sm text-zinc-400 mb-4">
+                        Diese App verwendet nur technisch notwendige Cookies für die Authentifizierung und funktionale Cookies für UI-Präferenzen.
+                    </p>
+                    <div className="space-y-2 text-sm">
+                        <div className="flex items-center gap-2 text-zinc-300">
+                            <Shield size={14} className="text-green-500" />
+                            <span><strong>Notwendig:</strong> Supabase Auth Cookies</span>
+                        </div>
+                        <div className="flex items-center gap-2 text-zinc-300">
+                            <Shield size={14} className="text-blue-500" />
+                            <span><strong>Funktional:</strong> Sprache, UI-Status</span>
+                        </div>
+                    </div>
+                </div>
+
+                {/* Data & Privacy */}
+                <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
+                    <h2 className="text-lg font-bold text-white mb-4 flex items-center gap-2">
+                        <Shield size={20} className="text-orange-500" />
+                        Datenschutz
+                    </h2>
+                    <div className="space-y-4">
+                        <p className="text-sm text-zinc-400">
+                            Deine Daten werden sicher auf EU-Servern gespeichert.
+                        </p>
+                        <Link
+                            href="/privacy"
+                            className="inline-block text-sm text-orange-500 hover:text-orange-400 underline"
+                        >
+                            Datenschutzerklärung lesen
+                        </Link>
+                    </div>
+                </div>
+
+                {/* Account info */}
+                <div className="bg-zinc-800/50 border border-zinc-700 rounded-2xl p-4 text-center">
+                    <p className="text-xs text-zinc-500">
+                        Mitglied seit: {new Date(profile?.created_at || '').toLocaleDateString('de-DE', {
+                            day: '2-digit',
+                            month: 'long',
+                            year: 'numeric'
+                        })}
+                    </p>
+                </div>
+            </main>
+        </div>
+    );
+}