Anthony 4bb07798dd Load draft bodies and stop spamming "No details for mail"
`load_mail_details_impl` now mirrors the TS `loadMailDetails` router:
when `mail.mailDetailsDraft` is set, call the new
`MailFacade::load_mail_details_draft` (sdk-mail-draft-details); when
`mail.mailDetails` is set, keep the existing blob path; otherwise return
`Ok(None)` — the legacy/malformed leaf the prefetch loop has to handle
anyway. Practical effect: the ~88 drafts on the test account that
previously logged "No details for mail" on every store change now decrypt
their body normally and surface it through IMAP FETCH.

The `Ok(None)` branch in `prefetch_details` was the secondary cause of
the log spam — with the prefetch loop now event-driven (Phase 2.5), every
`MailStore` bump re-queued the same 88 drafts because `has_eml` stayed
false. Persist a headers-only `.eml` and `mark_has_details = 1` on that
branch so the row is considered done; the next sweep skips it, and the
client at least gets the headers for a mail whose body we genuinely
cannot locate.
2026-05-28 15:51:14 +02:00
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