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/StarterPack/StarterPackLandingScreen.tsx

@@ -1,12 +1,9 @@
 import {useEffect, useState} from 'react'
 import {Pressable, View} from 'react-native'
 import Animated, {FadeIn, FadeOut} from 'react-native-reanimated'
-import {
-  AppBskyGraphDefs,
-  AppBskyGraphStarterpack,
-  AtUri,
-  type ModerationOpts,
-} from '@atproto/api'
+import {AppBskyGraphDefs, AppBskyGraphStarterpack} from '@atproto/api'
+import {AtUri} from '@atproto/syntax'
+import {type ModerationOpts} from '@bsky.app/sdk/moderation'
 import {msg} from '@lingui/core/macro'
 import {useLingui} from '@lingui/react'
 import {Trans} from '@lingui/react/macro'
@@ -38,6 +35,7 @@ import {RichText} from '#/components/RichText'
 import {Text} from '#/components/Typography'
 import {useAnalytics} from '#/analytics'
 import {IS_WEB, IS_WEB_MOBILE_ANDROID} from '#/env'
+import {app} from '#/lexicons'
 import * as bsky from '#/types/bsky'
 
 const AnimatedPressable = Animated.createAnimatedComponent(Pressable)
@@ -86,12 +84,7 @@ export function LandingScreen({
   }
 
   // Just for types, this cannot be hit
-  if (
-    !bsky.dangerousIsType<AppBskyGraphStarterpack.Record>(
-      starterPack.record,
-      AppBskyGraphStarterpack.isRecord,
-    )
-  ) {
+  if (!bsky.isType(app.bsky.graph.starterpack, starterPack.record)) {
     return null
   }