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/dms/ChatInvite/Root.tsx

@@ -1,5 +1,4 @@
 import {setStringAsync} from 'expo-clipboard'
-import {ChatBskyGroupDefs} from '@atproto/api'
 import {useLingui} from '@lingui/react/macro'
 import {useNavigation} from '@react-navigation/native'
 
@@ -18,6 +17,8 @@ import {type Props as SVGIconProps} from '#/components/icons/common'
 import {RaisingHand4Finger_Stroke2_Corner2_Rounded as HandIcon} from '#/components/icons/RaisingHand'
 import {useIntentDialogs} from '#/components/intents/IntentDialogs'
 import * as Toast from '#/components/Toast'
+import {chat} from '#/lexicons'
+import * as bsky from '#/types/bsky'
 import {
   type ChatInviteAction,
   ChatInviteProvider,
@@ -71,7 +72,7 @@ export function Root({
     status = 'loading'
   } else if (error) {
     status = 'error'
-  } else if (ChatBskyGroupDefs.isJoinLinkPreviewView(preview)) {
+  } else if (bsky.isType(chat.bsky.group.defs.joinLinkPreviewView, preview)) {
     status = 'available'
   } else {
     // Resolved to a disabled/invalid/unrecognized preview - nothing to join.
@@ -79,7 +80,7 @@ export function Root({
   }
 
   let action: ChatInviteAction | undefined
-  if (ChatBskyGroupDefs.isJoinLinkPreviewView(preview)) {
+  if (bsky.isType(chat.bsky.group.defs.joinLinkPreviewView, preview)) {
     const convoId = preview.convo?.id
     const isFollowing = preview.owner.viewer?.followedBy ?? false
     const hasRequested = !convoId && preview.viewer?.requestedAt != null