- Add listUnsubscribeHeader nullable text column to Emails table (schema v23) - Parse List-Unsubscribe header from IMAP (BODY.PEEK[HEADER.FIELDS]) and JMAP (header:List-Unsubscribe:asText property) - Show ActionChip in EmailDetailScreen that launches the unsubscribe URI (prefers mailto:, falls back to https:) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>