- cmd/mail.go: Fix duplicate --body/--body-file flag binding (both used bodyFile)
- internal/mail/client.go: Add PGP encryption to Send via EncryptBody, add passphrase to MoveToTrash and SendDraft
- internal/mail/pgp.go: Store armored private key, add getUnlockedKeyRing helper,
fix Decrypt/SignData/EncryptAndSign/DecryptAttachment to use passphrase via key.Unlock
- internal/mail/pgp.go: Add EncryptBody method for Send encryption with sender key
- cmd/draft.go: Update SendDraft call to include passphrase parameter