finish phase 3: type-only codemod and zero non-bridge @atproto/api imports

Task 8: codemod repointed 150 namespace-type files to #/lexicons
(AppBskyFeedDefs.PostView -> app.bsky.feed.defs.PostView, .Record -> .Main)
plus ~105 hand-fixed consumers (composer/video state, DebugMod, Profile,
onboarding, dialogs). DM_SERVICE_HEADERS deleted; last chat call sites on
the chat client. RichText.tsx flipped to SDK-only. Remaining @atproto/api
importers: the three session bridge files, the deliberate dual-world
matcher in lib/xrpc-error.ts, and test fixtures. toLex boundary casts are
TODO(phase4)-tagged for bridge removal.

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

src/screens/Settings/Settings.tsx

@@ -1,7 +1,6 @@
 import {useState} from 'react'
 import {Alert, LayoutAnimation, Linking, Pressable, View} from 'react-native'
 import {useReducedMotion} from 'react-native-reanimated'
-import {type AppBskyActorDefs} from '@atproto/api'
 import {moderateProfile} from '@bsky.app/sdk/moderation'
 import {Trans, useLingui} from '@lingui/react/macro'
 import {useNavigation} from '@react-navigation/native'
@@ -68,6 +67,7 @@ import {Text} from '#/components/Typography'
 import {useAnalytics} from '#/analytics'
 import {IS_INTERNAL, IS_IOS, IS_NATIVE} from '#/env'
 import {useActorStatus} from '#/features/liveNow'
+import {type app} from '#/lexicons'
 import {device, useStorage} from '#/storage'
 import {useActivitySubscriptionsNudged} from '#/storage/hooks/activity-subscriptions-nudged'
 import {toLex} from '#/types/bsky'
@@ -321,7 +321,7 @@ export function SettingsScreen({}: Props) {
 function ProfilePreview({
   profile,
 }: {
-  profile: AppBskyActorDefs.ProfileViewDetailed
+  profile: app.bsky.actor.defs.ProfileViewDetailed
 }) {
   const t = useTheme()
   const {gtMobile} = useBreakpoints()
@@ -609,7 +609,7 @@ function AccountRow({
   pendingDid,
   onPressSwitchAccount,
 }: {
-  profile?: AppBskyActorDefs.ProfileViewDetailed
+  profile?: app.bsky.actor.defs.ProfileViewDetailed
   account: SessionAccount
   pendingDid: string | null
   onPressSwitchAccount: (