Palace Mail self-heal complete. Here's the summary:

**All features verified working:**
- Layout renders correctly with owner tabs, account pills, split pane
- All IMAP inbox endpoints respond (4 accounts: ace-manglasabang, junwon-manglasabang, ace-palace, ace-palacering)
- Email detail, attachments, search, sent folder all functional
- Compose modal opens with correct fields and From dropdown
- VAPID key endpoint working

**One bug found and fixed:**
- **Pagination bug in `inbox.ts`** — when `total < perPage` and requesting page 2+, the `Math.max(1, ...)` clamp on `end` caused seq `1:1` to be fetched, returning a duplicate email. Fixed with an early return when the requested page is beyond the total, plus removal of the bad clamp. App rebuilt and verified.