## Summary
The runs list on a task's page now updates live, matching the main Runs
page. Run rows update their status, duration, and cost in place as runs
progress, and a "N new runs" button appears in the header when newer
runs come in so you can pull them into the list without a manual
refresh. This applies to both standard and scheduled task pages.
## Design
It reuses the Runs page's polling hook. A task page scopes its runs by
the task in the URL path rather than a `tasks` query filter, so the hook
now takes an optional task slug and scopes new-run detection to it. The
"new runs" button sits in the header, outside the deferred runs table,
so the count is lifted to the page and the click action is passed
through a ref. That keeps the table streaming on first load instead of
blocking the header on the runs query.
When newer runs come in, a `1 new run` button appears in the task page
header, to the left of the time filter. Clicking it pulls the new runs
into the list.
James Ritchie
3e53404f40