refactor(#358): W3b Settings Contribution-Wahrheit — hardcoded mail/ai/notifications Nav-Items entfernt (7 Plugins liefern settings_pages via Manifest, Dedup greift nicht mehr); Dashboard-Verify: Loader-Registry ist Vite-Code-Splitting-Technik, Widgets kommen via Manifest-API (Kritikpunkt 20a teilweise widerlegt)

frontend/src/pages/Settings.tsx

@@ -37,13 +37,12 @@ export function SettingsPage() {
     [manifests, user]
   );
 
+  // W3b (#358): Only true core settings — plugin settings come exclusively
+  // via pluginNavItems (settings_pages contributions). No duplication.
   const hardcodedNavItems = [
     { to: '/settings/stammdaten', label: 'Stammdaten', icon: '\ud83c\udfe2' },
     { to: '/settings/user-management', label: 'Nutzerverwaltung', icon: '\ud83d\udc65' },
     { to: '/settings/system', label: 'System', icon: '\u2699\ufe0f' },
-    { to: '/settings/mail', label: t('mail.settings'), icon: '\ud83d\udce7' },
-    { to: '/settings/ai-settings', label: 'KI Einstellungen', icon: '\ud83e\udde0' },
-    { to: '/settings/notifications', label: t('settings.notifications'), icon: '\ud83d\udd14' },
     { to: '/settings/custom-fields', label: 'Custom Fields', icon: '\ud83d\udccb' },
     { to: '/settings/webhooks', label: 'Webhooks', icon: '\ud83d\udd14' },
     { to: '/settings/workspaces', label: 'Workspaces', icon: '\ud83d\udd58\ufe0f' },