Scheduler sessions (source=cron) were listed in recents, where their
`[IMPORTANT: …]` first-message previews spammed the list — and because
cron runs are always newest, a burst of them consumed the whole recents
page budget and starved real conversations (sidebar showed 0 sessions).
Recents and cron jobs are now two independent lists:
- Backend: /api/sessions + /api/profiles/sessions accept source /
exclude_sources; session_count gains exclude_sources. Recents query
excludes cron; the cron section queries source=cron.
- Desktop: separate $cronSessions store + refreshCronSessions fetch, a
collapsed (persisted) "Cron jobs" section below Sessions that only
renders when cron sessions exist, with its own bounded scroller.
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