[SDK] Validate and brand the persisted account did (#11387)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

src/lib/strings/url-helpers.ts

@@ -1,4 +1,4 @@
-import {AtUri} from '@atproto/syntax'
+import {type AtIdentifierString, AtUri} from '@atproto/syntax'
 import {parse} from 'psl'
 import TLDs from 'tlds'
 
@@ -43,8 +43,8 @@ export function makeRecordUri(
   rkey: string,
 ) {
   const urip = new AtUri('at://placeholder.placeholder/')
-  // @ts-expect-error TODO new-sdk-migration
-  urip.host = didOrName
+  // the helper takes the did or handle as a plain string
+  urip.host = didOrName as AtIdentifierString
   urip.collection = collection
   urip.rkey = rkey
   return urip.toString()