Automatically mark messages as read when moved to Trash (IMAP sync improvement)

[ACX-Com]

### Feature Request: Automatically mark messages as read when moved to Trash

**Problem:**
When I move unread messages to the Trash folder, they remain marked as unread. This causes desktop clients like Outlook to falsely trigger notifications for messages that are no longer in the inbox.

**Proposed Solution:**
Add an optional setting in K-9 Mail to automatically mark messages as read when moved to Trash.

**Benefits:**
- Prevents false notifications on other IMAP clients
- Improves cross-device consistency
- Aligns with expected user behavior

Thanks for considering!

[Jon]

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