Can't log out/reset when homeserver becomes unreachable

### Steps to reproduce

(this happened on familiy member's device)

1. my homeserver needed to move hosts
2. my set-up uses .well-known delegation and the subdomain usually "invisible" to users changed from `synapse.` to `matrix.`
3. close the app or restart app/device

Related the same issue on android: https://github.com/vector-im/element-android/issues/4855

### Outcome

#### What did you expect?
- After the error about unreachable home server, offer the option to log out at least client side
- Maybe do a new .well-known lookup and offer to log in anew if the new delegated server is reachable, if not considered a security risk.

#### What happened instead?
can't do anything except re-install the app

### Your phone model

_No response_

### Operating system version

_No response_

### Application version

_No response_

### Homeserver

synapse

### Will you send logs?

No