All clear. Palace Mail is fully functional:

- Layout renders correctly — header, owner tabs (Junwon/Ace), account pills, split pane, compose button
- All 6 email accounts return valid inboxes
- Message detail, attachments, sent folder all work
- Compose opens with correct fields, reply/forward pre-fill correctly
- Search works in both INBOX and Sent
- Owner tab and account pill switching reload the inbox correctly
- No JavaScript errors, no broken API endpoints

No fixes were needed.