feat(admin): restructure settings into subpages and hub overview

shop/app/admin/einstellungen/branding/page.tsx

@@ -0,0 +1,124 @@
+'use client';
+
+import { useState, useEffect } from 'react';
+import { Button } from '@/components/ui/button';
+import { Loader2, Palette, Save } from 'lucide-react';
+import { createClient } from '@/lib/supabase/client';
+import { getBrandingSettings, saveBrandingSettings } from '@/lib/actions/branding';
+import type { BrandingSettings } from '@/lib/constants/branding';
+import { ColorThemePicker } from '@/components/admin/ColorThemePicker';
+import { useTheme } from '@/components/ThemeProvider';
+import { useRouter } from 'next/navigation';
+
+export default function BrandingPage() {
+  const [loading, setLoading] = useState(true);
+  const [branding, setBranding] = useState<BrandingSettings>({
+    companyName: '',
+    street: '',
+    zip: '',
+    city: '',
+    billingStreet: '',
+    billingZip: '',
+    billingCity: '',
+    sameBillingAddress: true,
+    colorScheme: 'modern_blue',
+    primaryColor: '#2563eb',
+    accentColor: '#38bdf8',
+  });
+  const [saving, setSaving] = useState(false);
+  const [msg, setMsg] = useState('');
+  const [msgType, setMsgType] = useState<'success' | 'error' | ''>('');
+  const { refreshBranding } = useTheme();
+  const router = useRouter();
+
+  useEffect(() => {
+    async function loadData() {
+      try {
+        const supabase = createClient();
+        const { data: { user } } = await supabase.auth.getUser();
+        if (!user) {
+          router.push('/auth/login');
+          return;
+        }
+        const brandRes = await getBrandingSettings();
+        if (brandRes) setBranding(brandRes);
+      } catch (e) {
+        console.error(e);
+      } finally {
+        setLoading(false);
+      }
+    }
+    loadData();
+  }, [router]);
+
+  const handleSave = async () => {
+    setSaving(true);
+    setMsg('');
+    try {
+      const res = await saveBrandingSettings(branding);
+      if (res.success) {
+        await refreshBranding();
+        setMsgType('success');
+        setMsg('Farbschema erfolgreich gespeichert.');
+      } else {
+        setMsgType('error');
+        setMsg(res.error || 'Fehler beim Speichern.');
+      }
+    } catch (err: any) {
+      setMsgType('error');
+      setMsg(err.message || 'Fehler beim Speichern.');
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  if (loading) {
+    return <div className="p-8 text-white flex justify-center items-center"><Loader2 className="w-8 h-8 animate-spin text-primary" /></div>;
+  }
+
+  return (
+    <div className="p-6 max-w-5xl mx-auto space-y-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-3xl font-extrabold tracking-tight text-white flex items-center gap-3">
+            <Palette className="w-8 h-8 text-violet-400" />
+            Branding & Design
+          </h1>
+          <p className="text-slate-400 text-xs mt-1">
+            Wählen Sie das primäre Farbschema und Akzente für den gesamten Webshop.
+          </p>
+        </div>
+
+        <Button onClick={handleSave} disabled={saving} className="bg-violet-600 hover:bg-violet-500 text-white rounded-xl px-5 h-10 text-xs font-bold">
+          {saving ? <Loader2 className="w-4 h-4 mr-2 animate-spin" /> : <Save className="w-4 h-4 mr-2" />}
+          Farben Speichern
+        </Button>
+      </div>
+
+      {msg && (
+        <div className={`p-3.5 rounded-xl text-xs font-medium border ${
+          msgType === 'success' ? 'bg-emerald-500/10 border-emerald-500/20 text-emerald-400' : 'bg-destructive/10 border-destructive/20 text-destructive'
+        }`}>
+          {msg}
+        </div>
+      )}
+
+      <div className="p-6 rounded-2xl bg-slate-900/60 border border-slate-800 space-y-5">
+        <ColorThemePicker
+          colorScheme={branding.colorScheme}
+          primaryColor={branding.primaryColor}
+          accentColor={branding.accentColor}
+          companyName={branding.companyName}
+          onChange={(scheme, primary, accent) =>
+            setBranding({
+              ...branding,
+              colorScheme: scheme,
+              primaryColor: primary,
+              accentColor: accent,
+            })
+          }
+        />
+      </div>
+    </div>
+  );
+}