migrate runtime call sites to lex clients and sdk actions

Phase 3 tasks 3-7 (parallel wave): composer/post pipeline on
pdsClient/appviewClient with structural+instance blob guards and a golden
CID fixture test; chat Convo/EventBus/queries on the dedicated chat client;
preferences sugar to SDK actions on the PDS client; remaining state/queries
producers (usePostThread unspecced flip, video scoped-token clients,
notifications, starter packs, lists) to client.call; UI runtime sweep
(AtUri from @atproto/syntax, moderation fns from @bsky.app/sdk/moderation,
SDK RichText, ozone reason tokens, guard rewrites via #/types/bsky).

Intermediate checkpoint (hooks skipped): ~114 typecheck errors remain in
cross-boundary consumer files, resolved by the type-only codemod next.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/state/queries/post-interaction-settings.ts

@@ -1,8 +1,9 @@
-import {type AppBskyActorDefs} from '@atproto/api'
+import {setPostInteractionSettings} from '@bsky.app/sdk'
 import {useMutation, useQueryClient} from '@tanstack/react-query'
 
 import {preferencesQueryKey} from '#/state/queries/preferences'
-import {useAgent} from '#/state/session'
+import {usePdsClient} from '#/state/session'
+import {app} from '#/lexicons'
 
 export function usePostInteractionSettingsMutation({
   onError,
@@ -12,10 +13,10 @@ export function usePostInteractionSettingsMutation({
   onSettled?: () => void
 } = {}) {
   const qc = useQueryClient()
-  const agent = useAgent()
+  const client = usePdsClient()
   return useMutation({
-    async mutationFn(props: AppBskyActorDefs.PostInteractionSettingsPref) {
-      await agent.setPostInteractionSettings(props)
+    async mutationFn(props: app.bsky.actor.defs.PostInteractionSettingsPref) {
+      await client.call(setPostInteractionSettings, props)
     },
     async onSuccess() {
       await qc.invalidateQueries({