Adds a `↳ build logs · {agent}` drill-in to every agent card that
opens the side panel and fetches the last 10 build-log headers from
GET /api/build-logs/{agent}. Each row shows a status chip (ok/fail/
running), kind, age, and truncated cmdline. Clicking a row lazily
fetches the full stdout+stderr from GET /api/build-logs/id/{id} and
expands it inline as a scrollable pre.
CSS additions: .build-logs-{panel,toolbar,list,item,row-btn,...} plus
.badge-ok/.badge-fail/.badge-running status chips shared with future
uses. docs/web-ui.md updated with the new drill-in and the new badge
classes.
cc6227ccb5