Update the default server URL in `defaults.ts` to `'https://server.discreetly.chat/'`.
Add a new function `getMessages()` in `server.ts` to retrieve messages from a server.
In `ChatRoom.svelte`, call `getMessages()` to fetch messages from the selected server and update the message store.
In `InputPrompt.svelte`, remove console log statements.
In `BackupIdentity.svelte`, add a cursor style to the QR Code button.
In `DeleteIdentity.svelte`, reset the application configuration after deleting the identity.
