feat(status): what is wrong first — down monitors and active alerts, and since when (#5120)

#5120 "Status page: what is wrong first".

- A "Needs attention" card heads the Status board: each down monitor with
  how long it has been down, and each active alert (firing, acknowledged,
  pending, no data) with its condition and how long, linking to its history.
- StatusEntry.since / since_at_least: when the current up/down run began,
  from the recent checks (streak_start); "for at least" when every check we
  have agrees.
- Counts as stat tiles (Down, Active alerts, Pending, Up); names wrap
  instead of being cut off; dots carry their label.
- Uptime and TLS are coloured by status_class against Settings → Thresholds
  instead of literal cutoffs; heartbeat pills and DOWN/UP use tokens and
  status_badge rather than hex and bold.
- tests/core/test_status_page.py: streak_start cases, and the rows render
  with the problem card before the list, each since-time, threshold tones
  and no hex colour.

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

steward/status/routes.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 from quart import Blueprint, current_app, render_template, request
 from sqlalchemy import func, select
 
+from steward.alerts.service import active_alerts
 from steward.auth.middleware import require_role
 from steward.core.status import collect_status, sparkline_svg
 from steward.models.hosts import Host
@@ -27,15 +28,18 @@ async def index():
 @status_bp.get("/rows")
 @require_role(UserRole.viewer)
 async def rows():
-    """HTMX fragment — the full status list + summary, refreshed on poll."""
+    """HTMX fragment — what is wrong (down monitors, active alerts), then the
+    full status list, refreshed on poll."""
     async with current_app.db_sessionmaker() as db:
         entries = await collect_status(db)
+        alerts = await active_alerts(db)
     for e in entries:
         if e.spark:
             e.spark_svg = sparkline_svg(e.spark)
     up, down, pending = _summarize(entries)
     return await render_template(
-        "status/rows.html", entries=entries, up=up, down=down, pending=pending
+        "status/rows.html", entries=entries, up=up, down=down, pending=pending,
+        alerts=alerts, problems=[e for e in entries if e.status == "down"],
     )