rework session layer on PasswordSession + three-client pattern

- PasswordSession (@atproto/lex-password-session) is now the single auth
  core; SessionAgent bridges it to the base Agent from @atproto/api so
  the ~148 useAgent() consumer files keep working unchanged
- SessionBundle carries {session, agent, accountClient, appviewClient};
  useLexClient() now returns the authed appview client, new
  useAppviewClient()/usePdsClient() hooks
- reducer: OpaqueSessionBundle, new replaced-current-bundle action for
  network-free cross-tab same-did sync (PasswordSession is immutable, so
  the bundle is rebuilt instead of mutated in place)
- moderation: AtpAgent.configure -> Client.configure + Agent.configure,
  per-account labelers on both the bridge and the appview client
- push-token unregistration uses temporary PasswordSessions
- hard-tail migrations: SignupQueued refresh via resumeSession shim,
  useBeginAgeAssurance scoped-token raw Client, useAccountEmailState
  reads currentAccount
- PDS routing preserved on the no-network resume fast path by
  synthesizing a minimal didDoc from the persisted pdsUrl

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

src/state/queries/resolve-uri.ts

@@ -1,15 +1,15 @@
-import {type AtpAgent, AtUri} from '@atproto/api'
+import {AtUri} from '@atproto/api'
 import {type QueryClient, queryOptions, useQuery} from '@tanstack/react-query'
 
 import {STALE} from '#/state/queries'
-import {useAgent} from '#/state/session'
+import {type SessionAgent, useAgent} from '#/state/session'
 import {useUnstableProfileViewCache} from './profile'
 
 const RQKEY_ROOT = 'resolved-did'
 export const RQKEY = (didOrHandle: string) => [RQKEY_ROOT, didOrHandle]
 
 const resolvedDidQueryOptions = (
-  agent: AtpAgent,
+  agent: SessionAgent,
   getUnstableProfile: (did: string) => {did: string} | undefined,
   didOrHandle: string | undefined,
 ) =>