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Outlook-Web-style pinning: a context-menu Pin/Unpin action stores a $pinned keyword on the message (plain IMAP-compatible flag, survives other clients), and pinned mails stay at the top of the folder list regardless of age, marked with a pin icon. Ordering is done server-side via the hasKeyword sort comparator (RFC 8621), applied consistently to the folder fetch, pagination and the push-refresh so page windows stay stable. The client-side safety sort in getEmails mirrors it, and sortThreadGroups keeps threads containing a pinned mail on top so the client-side thread grouping does not undo the order. The new-mail notification in refreshCurrentMailbox now checks the first non-pinned entry: with pinned mails on top, the newest mail is no longer at index 0 and arrivals would never have notified. The toggle reuses the color-tag pathway (routed keyword write for unified views, in-place local patch), then refetches the first page so the mail floats or sinks immediately. Search and unified views keep their existing order. Pin/Unpin strings are added to all 21 locales.