Palace Mail audit complete — everything passes.

**Tested:**
- Layout: header, owner tabs (Junwon/Ace), domain pills, split pane, compose button — all present
- Inbox API: all 7 accounts return correct counts
- Message detail: full message with HTML body and attachments
- Search API: results returned correctly
- Attachment download: 200 OK
- Compose/Reply/Forward: modal opens, fields pre-fill correctly (not sent)
- Thread mode toggle, swipe archive/delete, load more, owner tab switching, account pill switching — all working
- Error handling: unknown accounts and missing params return proper errors

No bugs found. No changes made.