feat(field-langs): register FieldLangs in the soma barrel + docs nav

Follow-up to the FieldLangs component: export it from the soma components
barrel and add its demo route to the docs sidebar.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/uix/soma/components/index.ts

@@ -26,6 +26,7 @@ export * as DropdownMenu from './dropdown-menu';
 export * as Editable from './editable';
 export * as Feed from './feed';
 export * as Field from './field';
+export * as FieldLangs from './field-langs';
 export * as FileUpload from './file-upload';
 export * as FloatPanel from './float-panel';
 export * as Form from './form';

web/routes/uix/+layout@.svelte

@@ -172,6 +172,7 @@
 			items: [
 				{ slug: '/uix/components/form', label: 'Form' },
 				{ slug: '/uix/components/field', label: 'Field' },
+				{ slug: '/uix/components/field-langs', label: 'Field langs' },
 				{ slug: '/uix/components/editable', label: 'Editable' },
 				{ slug: '/uix/components/words', label: 'Words' },
 				{ slug: '/uix/components/number-field', label: 'Number field' },