Palace Mail self-heal complete. Here's what was found and fixed:

**Fix Applied:** Added `gap: 8px` to `.list-bar` in `mail.astro` — the inbox toolbar (label, search input, threads toggle, message count) had no spacing between elements, causing them to touch.

**Everything else passed:**
- All 6 API endpoints working (inbox, message, search, archive, delete, attachment)
- All 6 mail accounts resolve correctly (junwon/ace × manglasabang/palace.fund/palacering)
- Layout renders correctly: header with owner tabs + account pills, split list/detail panes, compose button
- Compose opens with correct fields; Reply pre-fills To/Subject; Forward pre-fills Subject
- Owner tab and account pill switching reload inbox correctly
- Folder switching (INBOX, Sent, Archive) works
- Search with debounce works
- Thread mode toggle persists in localStorage
- Error handling for invalid accounts/UIDs works correctly