Preserving Read Status and Server Notification Settings

[rezeisdevil]

・Read Status
Once a message is marked as read, it should remain marked as read.

・Server Notification Settings
For each server, there are notification options such as “All Messages,” “Only @mentions,” and “No Notifications.”
These settings should also be preserved.

Currently, both of these reset to their default states after switching between bot accounts.

Switching Operation:
Switching from BOT1 to BOT2, and then back to BOT1.