Campaign details and archive

1. Campaigns has two tabs: Active (drafts, running and finished) and Archive. Finished campaigns can be moved to the archive from the list row or the campaign page (“Move to archive”); “Restore from archive” brings them back. A running campaign cannot be archived.
2. The campaign page starts with Campaign details: template, status, created/started dates, audience lists, filters, limits, send window and the stage contacts move to after sending.
3. “Sent to” lists every recipient with status (sent / failed) and time, linked to the contact; “Still to send” shows who is left. Finished campaigns also show the Content preview that was sent.