- mail.tsx: hide section-header "+" button when accounts.length === 0 — MailEmptyState's CTA is the sole add trigger; also replaces Pressable with TouchableOpacity
- MailEmptyState: Pressable → TouchableOpacity (no-Pressable rule)
- SheetFieldStack: add optional `intro?: ReactNode` prop rendered in a flexShrink:1 ScrollView above chips/active-input so it compresses gracefully when the keyboard is up
- ConnectMailSheet: move app-password guide + green AES block into `intro` prop so they're visible from the start, before the user types anything
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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