fix: plugin settings name must match package.json

Changed registerPluginSettings from 'headlamp-polaris-plugin' to 'polaris'
to match package.json name field. Headlamp requires exact match for
settings registration, otherwise settings page renders blank.

Root cause: When package.json was renamed to 'polaris' in PR #9,
the settings registration was not updated.

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>

src/index.tsx

@@ -66,7 +66,7 @@ registerRoute({
 });
 
 // Register plugin settings
-registerPluginSettings('headlamp-polaris-plugin', PolarisSettings, true);
+registerPluginSettings('polaris', PolarisSettings, true);
 
 // Register details view section for supported controller types
 registerDetailsViewSection(({ resource }) => {