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/components/Post/Embed/VideoEmbed/index.web.tsx

@@ -7,7 +7,6 @@ import {
   useState,
 } from 'react'
 import {View} from 'react-native'
-import {type AppBskyEmbedVideo} from '@atproto/api'
 import {msg} from '@lingui/core/macro'
 import {useLingui} from '@lingui/react'
 
@@ -25,6 +24,7 @@ import {
 } from '#/components/Post/Embed/VideoEmbed/VideoEmbedInner/VideoEmbedInnerWeb'
 import {useAnalytics} from '#/analytics'
 import {IS_WEB_FIREFOX} from '#/env'
+import {type app} from '#/lexicons'
 import {useActiveVideoWeb} from './ActiveVideoWebContext'
 import * as VideoFallback from './VideoEmbedInner/VideoFallback'
 
@@ -37,7 +37,7 @@ const noop = () => {}
  */
 const MIN_CARD_WIDTH = 280
 
-export function VideoEmbed({embed}: {embed: AppBskyEmbedVideo.View}) {
+export function VideoEmbed({embed}: {embed: app.bsky.embed.video.View}) {
   const t = useTheme()
   const ref = useRef<HTMLDivElement>(null)
   const {
@@ -284,7 +284,7 @@ function VideoError({
   error,
   retry,
 }: {
-  embed: AppBskyEmbedVideo.View
+  embed: app.bsky.embed.video.View
   error: unknown
   retry: () => void
 }) {