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/images/Gallery/index.tsx

@@ -14,7 +14,6 @@ import Animated, {
   useAnimatedRef,
 } from 'react-native-reanimated'
 import {Image} from 'expo-image'
-import {type AppBskyEmbedImages} from '@atproto/api'
 import {utils} from '@bsky.app/alf'
 import {Trans, useLingui} from '@lingui/react/macro'
 import debounce from 'lodash.debounce'
@@ -41,12 +40,13 @@ import {PostEmbedViewContext} from '#/components/Post/Embed/types'
 import {Text} from '#/components/Typography'
 import {useAnalytics} from '#/analytics'
 import {IS_ANDROID, IS_WEB} from '#/env'
+import {type app} from '#/lexicons'
 
 export * from './const'
 export * from './maybeApplyGalleryOffsetStyles'
 
 interface GalleryProps {
-  images: AppBskyEmbedImages.ViewImage[]
+  images: app.bsky.embed.images.ViewImage[]
   onPress?: (
     index: number,
     containerRefs: AnimatedRef<any>[],
@@ -404,7 +404,7 @@ function GalleryImage({
   onPreviewPress,
 }: {
   contentHeight: number
-  image: AppBskyEmbedImages.ViewImage
+  image: app.bsky.embed.images.ViewImage
   index: number
   imageCount: number
   onWidthChange: (index: number, width: number) => void