Read receipts in DMs and group chats

• In a DM, Seen appears under your latest message once the other person has read it; in a group chat, who has (Seen by Maya and Jonas), or Seen by everyone. Point at it for when. It changes live as people read.
• A conversation counts as read while it's open on someone's screen, not while it sits in a background tab.
• Each person can turn theirs off in Settings → Notifications (and then sees nobody's, as in Teams); admins can turn them off for everyone in Admin → General, which goes into the audit log. They show in conversations of up to 20 people; agents and other bots are never listed.
• API: GET/POST /dm/seen/{user_uuid} and /groupChat/seen/{grp_id}, POST /admin/read-receipts, read_receipts in /user/notificationPreferences, MQTT message type 34. Migration 195.

The flow of work in Reports

• Reports gain a cumulative flow chart: at the end of each week, the tasks to do (the backlog with them), in progress and in review, and what got done since the report began, as stacked bands. A band that keeps widening is work piling up at that step. It reads each task's history, so it covers the weeks before you updated too.
• The report's JSON gains flow (one entry a week, lined up with weeks).