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/screens/Messages/Conversation.tsx

@@ -1,11 +1,12 @@
 import {useCallback, useEffect, useMemo, useState} from 'react'
 import {type LayoutChangeEvent, View} from 'react-native'
 import {useSafeAreaInsets} from 'react-native-safe-area-context'
-import {ChatBskyConvoDefs, moderateProfile} from '@atproto/api'
+import {ChatBskyConvoDefs} from '@atproto/api'
 import {
   ScrollEdgeEffect,
   ScrollEdgeEffectProvider,
 } from '@bsky.app/expo-scroll-edge-effect'
+import {moderateProfile} from '@bsky.app/sdk/moderation'
 import {Trans, useLingui} from '@lingui/react/macro'
 import {
   type RouteProp,
@@ -45,6 +46,7 @@ import {type ConvoWithDetails, parseConvoView} from '#/components/dms/util'
 import {Error} from '#/components/Error'
 import * as Layout from '#/components/Layout'
 import {IS_LIQUID_GLASS} from '#/env'
+import {toLex} from '#/types/bsky'
 import {ChatDisabled} from './components/ChatDisabled'
 import {ChatEnded} from './components/ChatEnded'
 import {ChatLocked} from './components/ChatLocked'
@@ -225,7 +227,8 @@ function InnerReady({
   const moderationOpts = useModerationOpts()
   const primaryMemberModeration = useMemo(() => {
     if (!primaryMember || !moderationOpts) return null
-    return moderateProfile(primaryMember, moderationOpts)
+    // TODO(phase4): drop toLex once useMaybeProfileShadow emits #/lexicons views
+    return moderateProfile(toLex(primaryMember), moderationOpts)
   }, [primaryMember, moderationOpts])
 
   const header = <MessagesListHeader convo={convo} />