Rename sidebar top-level label from 'TNS CSI' to 'TrueNAS'

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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

src/index.tsx

@@ -28,7 +28,7 @@ import VolumesPage from './components/VolumesPage';
 registerSidebarEntry({
   parent: null,
   name: 'tns-csi',
-  label: 'TNS CSI',
+  label: 'TrueNAS',
   url: '/tns-csi',
   icon: 'mdi:database-cog',
 });