fix(firewall): Tab-Farben im globalen ConfigProvider — AntD 6 Tokens korrekt

Nested ConfigProvider überschreibt Root-Provider in AntD 6 nicht zuverlässig.
Tabs-Tokens (itemColor #334155, hover #0F172A, selected/inkBar #0EA5E9,
fontSize 13, padding 10px 18px) direkt in globalem antdTheme in App.tsx.

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

management-ui/src/App.tsx

@@ -62,6 +62,16 @@ const antdTheme = {
     colorTextSecondary: '#64748B',
     controlHeight: 34,
   },
+  components: {
+    Tabs: {
+      itemColor: '#334155',
+      itemHoverColor: '#0F172A',
+      itemSelectedColor: '#0EA5E9',
+      inkBarColor: '#0EA5E9',
+      titleFontSize: 13,
+      horizontalItemPadding: '10px 18px',
+    },
+  },
 }
 
 function RequireAuth({ children }: { children: ReactNode }) {

management-ui/src/pages/Firewall/index.tsx

@@ -1,4 +1,4 @@
-import { ConfigProvider, Space, Tag, Tabs } from 'antd'
+import { Space, Tag, Tabs } from 'antd'
 import { CheckCircleOutlined, CloseCircleOutlined, FireOutlined, SafetyOutlined } from '@ant-design/icons'
 import { useTranslation } from 'react-i18next'
 import { useQuery } from '@tanstack/react-query'
@@ -125,16 +125,7 @@ export default function FirewallPage() {
         )}
       />
       <FirewallKPIStrip nftablesActive={nftables?.active} />
-      <ConfigProvider theme={{ components: { Tabs: {
-        itemColor: '#475569',
-        itemHoverColor: '#1e293b',
-        itemSelectedColor: '#1677ff',
-        inkBarColor: '#1677ff',
-        titleFontSize: 13,
-        horizontalItemPadding: '10px 16px',
-      }}}}>
-        <Tabs items={tabs} defaultActiveKey="rules" />
-      </ConfigProvider>
+      <Tabs items={tabs} defaultActiveKey="rules" />
     </div>
   )
 }