UAT round 4:
- Discovery table: move Actions to the first column, mirroring the Subscriptions
table (where it sits right after Prio) so both tabs' actions line up.
- The manager's tabs now ride in history.state (`_chTab`), the same way the channel
page (`_chan`) and the live search (`_yt`) already do — so Back steps back through
the tabs you visited before it leaves the module. Arriving from elsewhere stamps
the entry setPage pushed (one navigation never costs two Back presses).
- Turning a page now scrolls the list back to its top (both the tables and the card
grid, since they share Pager) — landing mid-list in an unseen page is disorienting.
peter
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