refactor: move integrations overview from main nav into admin area

Remove the top-level "Integrationen" sidebar entry and add an "Uebersicht"
tab to the admin integrations page with summary stats and integration cards.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/app/[locale]/(auth)/admin/integrations/admin-integrations-content.tsx

@@ -16,6 +16,10 @@ import {
   Eye,
   EyeOff,
   Loader2,
+  Plug,
+  CheckCircle2,
+  AlertCircle,
+  LayoutGrid,
   type LucideIcon,
 } from 'lucide-react';
 
@@ -41,7 +45,7 @@ import {
 } from '@/components/ui/select';
 import { Skeleton } from '@/components/ui/skeleton';
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
-import { IntegrationStatusBadge } from '@/components/integrations';
+import { IntegrationStatusBadge, IntegrationCard } from '@/components/integrations';
 import { useAllIntegrationStatuses } from '@/hooks/integrations';
 import {
   useCredentials,
@@ -459,11 +463,14 @@ function IntegrationPanel({ integrationType }: IntegrationPanelProps) {
  * Lists each integration as a tab; each tab loads its own credential
  * state so queries are isolated and only triggered when the tab is visited.
  */
-export function AdminIntegrationsContent({ locale: _locale }: AdminIntegrationsContentProps) {
+export function AdminIntegrationsContent({ locale }: AdminIntegrationsContentProps) {
   const t = useTranslations('integrations');
   const tAdmin = useTranslations('admin');
   const { data: integrations, isLoading } = useAllIntegrationStatuses();
 
+  const connectedCount = integrations?.filter((i) => i.status === 'connected').length ?? 0;
+  const errorCount = integrations?.filter((i) => i.status === 'error').length ?? 0;
+
   return (
     <div className="container mx-auto space-y-8 py-6">
       {/* Header */}
@@ -501,8 +508,12 @@ export function AdminIntegrationsContent({ locale: _locale }: AdminIntegrationsC
           ))}
         </div>
       ) : (
-        <Tabs defaultValue="plentyone" className="space-y-4">
+        <Tabs defaultValue="overview" className="space-y-4">
           <TabsList className="flex-wrap">
+            <TabsTrigger value="overview" className="gap-2">
+              <LayoutGrid className="h-4 w-4" />
+              {t('overview')}
+            </TabsTrigger>
             {integrations?.map((config) => {
               const meta = integrationMeta[config.type];
               const Icon = meta.icon;
@@ -515,6 +526,78 @@ export function AdminIntegrationsContent({ locale: _locale }: AdminIntegrationsC
             })}
           </TabsList>
 
+          {/* Overview tab */}
+          <TabsContent value="overview">
+            <motion.div
+              initial={{ opacity: 0, y: 20 }}
+              animate={{ opacity: 1, y: 0 }}
+              transition={{ duration: 0.3 }}
+              className="space-y-6"
+            >
+              {/* Summary Stats */}
+              <div className="grid gap-4 md:grid-cols-3">
+                <Card>
+                  <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+                    <CardTitle className="text-sm font-medium">{t('allIntegrations')}</CardTitle>
+                    <Plug className="h-4 w-4 text-muted-foreground" />
+                  </CardHeader>
+                  <CardContent>
+                    <div className="text-2xl font-bold">{integrations?.length ?? 0}</div>
+                  </CardContent>
+                </Card>
+
+                <Card>
+                  <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+                    <CardTitle className="text-sm font-medium">{t('connected')}</CardTitle>
+                    <CheckCircle2 className="h-4 w-4 text-green-500" />
+                  </CardHeader>
+                  <CardContent>
+                    <div className="text-2xl font-bold text-green-500">{connectedCount}</div>
+                  </CardContent>
+                </Card>
+
+                <Card>
+                  <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+                    <CardTitle className="text-sm font-medium">{t('error')}</CardTitle>
+                    <AlertCircle className="h-4 w-4 text-destructive" />
+                  </CardHeader>
+                  <CardContent>
+                    <div className={cn('text-2xl font-bold', errorCount > 0 && 'text-destructive')}>
+                      {errorCount}
+                    </div>
+                  </CardContent>
+                </Card>
+              </div>
+
+              {/* Integration Cards Grid */}
+              <motion.div
+                initial="hidden"
+                animate="visible"
+                variants={{
+                  hidden: { opacity: 0 },
+                  visible: {
+                    opacity: 1,
+                    transition: { staggerChildren: 0.1 },
+                  },
+                }}
+                className="grid gap-4 md:grid-cols-2 lg:grid-cols-3"
+              >
+                {integrations?.map((config) => (
+                  <motion.div
+                    key={config.id}
+                    variants={{
+                      hidden: { opacity: 0, y: 20 },
+                      visible: { opacity: 1, y: 0 },
+                    }}
+                  >
+                    <IntegrationCard config={config} locale={locale} showActions={false} />
+                  </motion.div>
+                ))}
+              </motion.div>
+            </motion.div>
+          </TabsContent>
+
+          {/* Individual integration tabs */}
           {integrations?.map((config) => (
             <TabsContent key={config.type} value={config.type}>
               <motion.div

apps/web/src/components/layout/sidebar.tsx

@@ -25,7 +25,6 @@ import {
   Network,
   Building2,
   UserPlus,
-  MessageSquare,
   type LucideIcon,
 } from 'lucide-react';
 
@@ -106,30 +105,6 @@ const mainNavItems: NavItem[] = [
       },
     ],
   },
-  {
-    key: 'integrations',
-    href: '/integrations',
-    icon: Plug,
-    requiredRoles: ['manager', 'admin'],
-    children: [
-      {
-        key: 'overview',
-        href: '/integrations',
-        icon: Plug,
-        exactMatch: true,
-      },
-      {
-        key: 'plentyOne',
-        href: '/integrations/plentyone',
-        icon: Building2,
-      },
-      {
-        key: 'zulip',
-        href: '/integrations/zulip',
-        icon: MessageSquare,
-      },
-    ],
-  },
 ];
 
 const bottomNavItems: NavItem[] = [