fix(SW-236): properly handle expired token in webviews

Trying out a new pattern for errors in data fetching.

Next.js is not a fan of throwing errors. Instead it recommends returning
different shapes for each state. Ref:
https://nextjs.org/docs/app/building-your-application/routing/error-handling#handling-expected-errors-from-server-components

It requires some more detailing and a bit more refactoring in non webview part,
but it is a start. This webview specific implementation should not break web.

components/MyPages/Blocks/Overview/index.tsx

@@ -21,7 +21,7 @@ export default async function Overview({
   lang,
 }: AccountPageComponentProps & LangParams) {
   const user = await serverClient().user.get()
-  if (!user) {
+  if (!user || "error" in user) {
     return null
   }