First release of LibreMail.

* Outlook/Microsoft (OAuth 2.0), Gmail/Yahoo/iCloud (app password), and generic IMAP/SMTP accounts
* Offline-first mail cache with full-history backfill and background sync
* Rich-text compose, drafts, signatures, attachments, and a reliable outbox
* Unified inbox across multiple accounts, local + server search
* New-mail notifications and optional IMAP IDLE instant push
* Hardened HTML reader: JavaScript off, remote images blocked by default
