chore: add server switcher (#2717)

* wip

* wip2

* refactor: use radio button group

* chore: add persisting host per workspace

* chore: header style

* chore: update server picker title style

* chore: margin

* chore: label

* chore: remove separator

* rename migration to latest snjs version

---------

Co-authored-by: Aman Harwara <amanharwara@protonmail.com>

packages/snjs/lib/Services/Session/SessionManager.ts

@@ -169,7 +169,7 @@ export class SessionManager
       }
     }
 
-    const serverHost = this.storage.getValue<string>(StorageKey.ServerHost)
+    const serverHost = this.storage.getValue<string | undefined>(`${StorageKey.ServerHost}:${this.workspaceIdentifier}`)
     if (serverHost) {
       void this.apiService.setHost(serverHost)
       this.httpService.setHost(serverHost)