feat(contact): full validation, CMS-translated strings, smaller UI

- contact-form-validation.ts: shared client+server validator returning
  {key, params} so messages can be translated via the CMS bundle.
- ContactFormComponent: 3 honeypots, subject field, GDPR consent
  checkbox, character counter, inline per-field errors after submit,
  uses useTranslate() everywhere.
- /api/contact: origin allowlist, multiple honeypot check, client-age
  gate, server-side re-validation, forwards X-Forwarded-For + UA to
  CMS forms plugin with consent timestamp in payload.
- TextInput/Textarea: new size="sm" variant (rounded-sm, shadow-sm,
  h-10, smaller padding/text). Default "md" unchanged.
- translations.ts: 37 new contact_* keys.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/block-types.ts

@@ -428,7 +428,6 @@ export type InternalComponentId = "form-contact";
 export interface InternalComponentBlockData {
   _type?: "internal_component";
   _slug?: string;
-  id?: string;
   component?: InternalComponentId;
   layout?: BlockLayout;
 }