[PB-6431]: feat/email encryption#56
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Adds end-to-end encryption for mail. On send, the body and a short list-preview snippet are sealed with a hybrid scheme; on read, the body and previews are decrypted client-side.
services/mail-encryption): encrypts body + preview under one symmetric key, wrapped per-recipient. Wrapped keys ship as a de-identified, order-randomized array carrying no addresses, so the recipient set (Bcc included) stays hidden; recipients find their entry by trial decryption. Subject stays cleartext so the backend can index/search it.services/recipient-keys,store/api/mail): resolves recipients' public keys before an encrypted send; falls back to a cleartext send if any recipient has no key.compose-message): wires lookup + encryption into the send flow.useDecryptedMaildecrypts the opened message;useDecryptedPreviewsdecrypts list/search row previews (encrypted rows show a blank snippet until decrypted, never ciphertext).SendEmailError,FetchRecipientKeysError,FetchActiveDomainsError) and i18n keys across all locales.