fix: use friendly name 'Sealed Secrets' in settings UI

Changed plugin settings registration name from 'headlamp-sealed-secrets'
to 'Sealed Secrets' for better user experience in Settings → Plugins.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

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

headlamp-sealed-secrets/src/index.tsx

@@ -107,7 +107,7 @@ registerDetailsViewSection(({ resource }) => {
  * Settings will appear in Settings → Plugins → Sealed Secrets
  */
 registerPluginSettings(
-  'headlamp-sealed-secrets',
+  'Sealed Secrets',
   () => (
     <GenericErrorBoundary>
       <SettingsPage />