receive and display direct messages

[PlexSheep]

[PlexSheep]

[2025-12-07T14:49:13Z ERROR sremp_client::domain] Error while processing network event: MessagePack decode error: string found to be invalid
 utf8: invalid utf-8 sequence of 1 bytes from index 1

The problem is that we can't decode the received frame!

[PlexSheep]

now that #54 is implemented, i want to use this to better find out why my sent messages don't get serialized. The error has somewhat changed and i think I've seen it not be entirely consistent, but this is basically what i need to fix:

[2026-01-25T16:10:17Z INFO  sremp_client::domain::jobs] Processing Net Event: Message received from 127.0
.0.1:31048 (4D2D8CA5ABEAC5F29E7D1E9A01EB04EFD8D38941BFBBAC7A4F89DA6F136E3465) | C
[2026-01-25T16:10:17Z ERROR sremp_client::domain] Error while processing network event: MessagePack decod
e error: invalid type: integer `42`, expected struct Message | C
test test_client_connect_exchange_disconnect ... FAILED