Improvements to persisted state migration (#2098)

* Fix session email/emailConfirmed types, update usage for safer access

* Handle fallback better, better errors

* Better handling, add test

* Add test for default data

* Remove fallback, not needed, update logs

src/state/session/index.tsx

@@ -245,7 +245,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
         service: agent.service.toString(),
         did: agent.session.did,
         handle: agent.session.handle,
-        email: agent.session.email!, // TODO this is always defined?
+        email: agent.session.email,
         emailConfirmed: agent.session.emailConfirmed || false,
         refreshJwt: agent.session.refreshJwt,
         accessJwt: agent.session.accessJwt,
@@ -342,7 +342,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
         service: agent.service.toString(),
         did: agent.session.did,
         handle: agent.session.handle,
-        email: agent.session.email!, // TODO this is always defined?
+        email: agent.session.email,
         emailConfirmed: agent.session.emailConfirmed || false,
         refreshJwt: agent.session.refreshJwt,
         accessJwt: agent.session.accessJwt,