[🐴] Reorg convo files (#3909)

* Remove unused prop

* Reorganize

src/state/messages/index.tsx

@@ -1,79 +1,7 @@
-import React, {useContext, useState, useSyncExternalStore} from 'react'
-import {AppState} from 'react-native'
-import {BskyAgent} from '@atproto-labs/api'
-import {useFocusEffect, useIsFocused} from '@react-navigation/native'
+import React from 'react'
 
-import {Convo, ConvoParams, ConvoState} from '#/state/messages/convo'
 import {CurrentConvoIdProvider} from '#/state/messages/current-convo-id'
 import {MessagesEventBusProvider} from '#/state/messages/events'
-import {useMarkAsReadMutation} from '#/state/queries/messages/conversation'
-import {useAgent} from '#/state/session'
-import {useDmServiceUrlStorage} from '#/screens/Messages/Temp/useDmServiceUrlStorage'
-
-const ChatContext = React.createContext<ConvoState | null>(null)
-
-export function useChat() {
-  const ctx = useContext(ChatContext)
-  if (!ctx) {
-    throw new Error('useChat must be used within a ChatProvider')
-  }
-  return ctx
-}
-
-export function ChatProvider({
-  children,
-  convoId,
-}: Pick<ConvoParams, 'convoId'> & {children: React.ReactNode}) {
-  const isScreenFocused = useIsFocused()
-  const {serviceUrl} = useDmServiceUrlStorage()
-  const {getAgent} = useAgent()
-  const [convo] = useState(
-    () =>
-      new Convo({
-        convoId,
-        agent: new BskyAgent({
-          service: serviceUrl,
-        }),
-        __tempFromUserDid: getAgent().session?.did!,
-      }),
-  )
-  const service = useSyncExternalStore(convo.subscribe, convo.getSnapshot)
-  const {mutate: markAsRead} = useMarkAsReadMutation()
-
-  useFocusEffect(
-    React.useCallback(() => {
-      convo.resume()
-      markAsRead({convoId})
-
-      return () => {
-        convo.background()
-        markAsRead({convoId})
-      }
-    }, [convo, convoId, markAsRead]),
-  )
-
-  React.useEffect(() => {
-    const handleAppStateChange = (nextAppState: string) => {
-      if (isScreenFocused) {
-        if (nextAppState === 'active') {
-          convo.resume()
-        } else {
-          convo.background()
-        }
-
-        markAsRead({convoId})
-      }
-    }
-
-    const sub = AppState.addEventListener('change', handleAppStateChange)
-
-    return () => {
-      sub.remove()
-    }
-  }, [convoId, convo, isScreenFocused, markAsRead])
-
-  return <ChatContext.Provider value={service}>{children}</ChatContext.Provider>
-}
 
 export function MessagesProvider({children}: {children: React.ReactNode}) {
   return (