feat(monitors): a monitor's page reads as a page — response time over 24h, labelled actions, how long, not "ago"; the add form says what each type checks (#5214)

Monitor page: a response-time chart for the last day with failed checks
marked; Edit / Pause / Delete as labelled buttons; the state tile says
"for 29m" instead of "for at least 29m 25s ago"; the check strip fills
its card; no failures is one line, not an empty box; Settings names the
type, target and the actual global interval, with readable field names.

Add monitor: a line under the fields says what the selected type checks
and when it counts as up; Name says it defaults to the target.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

steward/monitors/routes.py

@@ -114,6 +114,7 @@ async def detail(monitor_id: str):
             return redirect(url_for("monitors.index"))
         st = (await monitor_svc.monitor_states(db, [m]))[m.id]
         failures = await monitor_svc.recent_failures(db, m.id)
+        history = await monitor_svc.response_history(db, m.id, datetime.now(timezone.utc))
         host = await db.get(Host, m.host_id) if m.host_id else None
     thresholds = current_app.config.get("THRESHOLDS", {})
     latest = st["latest"]
@@ -129,6 +130,7 @@ async def detail(monitor_id: str):
         since=since, since_at_least=since_at_least, uptime=st["uptime"], tls_days=tls_days,
         heartbeat=[{"state": "up" if r.is_up else "down", "title": _heartbeat_title(m.type, r)}
                    for r in st["recent"]],
+        history=history, poll_interval=current_app.config.get("MONITORS_POLL_INTERVAL", 60),
     )