- Add LocalSieveApplied table (schema v32) keyed by (accountId, messageId)
so each email is processed by Sieve at most once, even across restarts.
- Implement EmailRepository.applySieveRules(): loads the active local Sieve
script, runs the interpreter against new INBOX emails, and queues pending
move/delete/flag_seen changes for any matched rules.
- Wire applySieveRules() into both _AccountSync._sync() and
_JmapAccountSync._sync() after the per-mailbox email sync loop.
- Make _flushPendingChangesImap() treat NONEXISTENT / not-found errors as
silent no-ops (counts as flushed) so a second device racing on the same
email does not accumulate retries.
- Add migration test assertions and a dedicated unit test suite covering
rule matching, deduplication, discard, and multi-email processing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
