sync jobs: message_count stays 0 and peer_title shows "Unknown" after successful sync

[kfastov]

Problem

After adding a sync job and running sync --once, messages are actually downloaded (visible via messages list --source archive), but the job status shows message_count: 0 and peer_title: "Unknown".

Repro

# Add sync job for a forum supergroup
tgcli sync jobs add --chat <supergroup-id> --depth 5000 --json
# → status: pending, message_count: 0

# Run sync
tgcli sync --once

# Check job status
tgcli sync jobs list --json
# → status: in_progress, message_count: 0, peer_title: "Unknown"

# But messages ARE there
tgcli messages list --chat <supergroup-id> --source archive --limit 5 --json
# → returns 5 messages

Expected

• message_count should reflect actual archived messages
• peer_title should resolve from cache (other commands like channels show resolve it fine)
• Clear distinction between "actively syncing" vs "completed a batch but has more to go" vs "done"

[kfastov]

Verified on main: message_count is updated after every backfill cycle via _updateJobRecord using a live COUNT(*) (finalCount, message-sync-service.js:2756 & 3533), so it no longer stays 0. peer_title is populated via refreshChannelsFromDialogs() (cli.js:1645 -> :1253) and _syncNewerMessages (message-sync-service.js:3372). Residual edge case: a job added for a peer absent from your dialog list and with no newly-synced message could still render "Unknown" until a title is fetched. Closing since the reported symptoms are resolved — reopen if that edge case bites.