[SDK] Add refreshSession and migrate the session-pinned infra (#11381)

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

src/lib/api/index.ts

@@ -32,7 +32,6 @@ import {app, com} from '#/lexicons'
 import * as bsky from '#/types/bsky'
 import {createGIFDescription} from '../gif-alt-text'
 import {computeCid} from './computeCid'
-import {fromLegacyBlobRef} from './legacy-blob'
 import {uploadBlob} from './upload-blob'
 
 export {uploadBlob}
@@ -410,10 +409,11 @@ async function resolveMedia(
     return {
       $type: 'app.bsky.embed.video',
       /*
-       * The video pipeline still reads its blob off the legacy agent, so
-       * normalize it to the lex shape before it reaches the lex write.
+       * The video blob is a plain lex blob from the video pipeline
+       * (getJobStatus, in composer state/video). Its structural shape matches
+       * the lexicon blob field and the CID hasher (see computeCid).
        */
-      video: fromLegacyBlobRef(videoDraft.pendingPublish.blobRef),
+      video: videoDraft.pendingPublish.blobRef,
       alt: videoDraft.altText || undefined,
       captions: captions.length === 0 ? undefined : captions,
       aspectRatio,

src/lib/api/legacy-blob.ts

@@ -14,18 +14,3 @@ import {type BlobRef as LexBlobRef} from '@atproto/lex'
 export function toLegacyBlobRef(blob: LexBlobRef): BlobRef {
   return BlobRef.fromJsonRef(blob as Parameters<typeof BlobRef.fromJsonRef>[0])
 }
-
-/**
- * Normalize a legacy `BlobRef` class instance to the plain-JSON lex blob shape.
- *
- * Required for any blob that reaches a lex write: the lex serializer walks
- * plain objects, so a class instance goes on the wire with its internal
- * `original` field and no `$type`. `ipld()` yields exactly the lex shape, and
- * hashes identically (see `computeCid.test.ts` case 2b).
- *
- * Only the video pipeline still needs this - it reads its blob off the legacy
- * agent (`app.bsky.video.getJobStatus`). Drop it when the video client moves.
- */
-export function fromLegacyBlobRef(blob: BlobRef): LexBlobRef {
-  return blob.ipld()
-}

src/lib/api/resolve.ts

@@ -184,7 +184,7 @@ export async function resolveLink(
       view: res.data.starterPack,
     }
   }
-  return resolveExternal(agent, uri)
+  return resolveExternal(uri)
 
   // Forked from useGetPost. TODO: move into RQ.
   async function getPost({uri}: {uri: string}) {
@@ -258,11 +258,8 @@ function getFileSlug(url: string | undefined): string | undefined {
   return dotIndex > 0 ? filename.slice(0, dotIndex) : undefined
 }
 
-async function resolveExternal(
-  agent: AtpAgent,
-  uri: string,
-): Promise<ResolvedExternalLink> {
-  const result = await getLinkMeta(agent, uri)
+async function resolveExternal(uri: string): Promise<ResolvedExternalLink> {
+  const result = await getLinkMeta(uri)
   return {
     type: 'external',
     uri: result.url,