Refactor post threads to use react query (#1851)

* Add post and post-thread queries

* Update PostThread components to use new queries

* Move from normalized cache to shadow cache model

* Merge post shadow into the post automatically

* Remove dead code

* Remove old temporary session

* Fix: set agent on session creation

* Temporarily double-login

* Handle post-thread uri resolution errors

src/state/session/index.tsx

@@ -186,6 +186,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
         }),
       )
 
+      setState(s => ({...s, agent}))
       upsertAccount(account)
 
       logger.debug(`session: logged in`, {
@@ -238,6 +239,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
         }),
       )
 
+      setState(s => ({...s, agent}))
       upsertAccount(account)
     },
     [upsertAccount],