feat: update ui-settings to use dark/light theme values

- Change UITHEME_DEFAULT from 'polkadot'/'substrate' to 'light'
- Update UITHEMES options to use 'dark'/'light' values
- Update ICONS to use 'pezkuwi'/'bizinikiwi' branding
- Add isPezkuwi check for domain detection
- Bump ui-settings version to 3.16.9

packages/vue-identicon/src/packageInfo.ts

@@ -3,4 +3,4 @@
 
 // Do not edit, auto-generated by @pezkuwi/dev
 
-export const packageInfo = { name: '@pezkuwi/vue-identicon', path: 'auto', type: 'auto', version: '3.16.6' };
+export const packageInfo = { name: '@pezkuwi/vue-identicon', path: 'auto', type: 'auto', version: '3.16.8' };