fix: correct settings JSX structure, update display name, improve params handling

- Fix extra closing Box tag in SettingsPage causing blank display
- Change display name from 'Sealed Secrets Plugin for Headlamp' to 'Sealed Secrets'
- Use default values for params to avoid undefined in hooks (fixes retry button issue)

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

headlamp-sealed-secrets/src/components/SettingsPage.tsx

@@ -151,6 +151,6 @@ export function SettingsPage() {
             <dd style={{ display: 'inline', margin: 0 }}>8080</dd>
           </Typography>
         </Box>
-      </Box>
+    </Box>
   );
 }