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/view/screens/Settings.tsx

@@ -299,7 +299,7 @@ export function SettingsScreen({}: Props) {
                 </>
               )}
               <Text type="lg" style={pal.text}>
-                {currentAccount.email}{' '}
+                {currentAccount.email || '(no email)'}{' '}
               </Text>
               <Link onPress={() => openModal({name: 'change-email'})}>
                 <Text type="lg" style={pal.link}>