Palace Mail self-heal complete. All tests passed with no bugs found:

**Phase 1 — Layout:** Every structural element renders correctly — header with Junwon/Ace owner tabs, account pills for all 3 domains, split list/detail pane, compose button, search bar, folder tabs.

**Phase 2 — APIs:** All 6 accounts tested across INBOX and Sent:
- `/api/mail/inbox` — All 12 account/folder combinations return correct data
- `/api/mail/message` — Subject, from, to, date, HTML body, attachments all return correctly
- `/api/mail/search` — Filtered results with pagination work
- `/api/mail/attachment` — Binary download returns HTTP 200
- Push notification endpoints (vapid-key, subscribe) — Both work

**JavaScript logic verified:** Owner tab switching, account pill switching, thread grouping, reply/forward prefilling, compose modal, swipe-to-archive/delete, pull-to-refresh, search debounce, shadow DOM for safe HTML rendering — all correct.

No fixes were needed.