feat(ui): a host's "Full metrics" heads its page, and a resource's anomalies are one line with a way to review them (#6797)

The host page's link to the full metrics sat in the Agent card, under the
anomaly card and the vitals strip, and was missed. It now heads the vitals
strip at the top of the page.

The anomaly card on the host, monitor, container and Traefik pages listed
every anomaly of the last 30 days with its review form, reviewed ones
included, and took over the top of the page. It is now one line: how many
wait for review, which are out of their normal now, and a Review button to
Alerts → Anomalies narrowed to that resource (?source=&resource=), where a
review returns. It is hidden when nothing waits and nothing is going on.
The callers fetch up to 100 rows so the count isn't capped at 10 or 20.

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

steward/alerts/routes.py

@@ -284,15 +284,24 @@ async def alert_history():
 @require_role(UserRole.viewer)
 async def anomalies():
     """Metric anomalies (#5740): those to review, newest occurrence first,
-    then the reviewed and lapsed ones under day dividers."""
+    then the reviewed and lapsed ones under day dividers. `source` and
+    `resource` narrow it to one resource's, its parts included: a resource's
+    page links here with them."""
+    from urllib.parse import urlencode
     from steward.audit.service import mark_day_groups
     from steward.core import anomalies as anom
     from steward.core import formatting as fmt
+    source = request.args.get("source", "").strip() or None
+    resource = request.args.get("resource", "").strip() or None
+    only = {"source": source, "resource": resource}
     async with current_app.db_sessionmaker() as db:
-        to_review = await anom.views(db, await anom.list_anomalies(db, (anom.TO_REVIEW,)))
+        to_review = await anom.views(db, await anom.list_anomalies(db, (anom.TO_REVIEW,), **only))
         past = await anom.views(db, await anom.list_anomalies(
-            db, (anom.NORMAL, anom.REAL, anom.LAPSED), limit=PAGE_SIZE * 4))
+            db, (anom.NORMAL, anom.REAL, anom.LAPSED), limit=PAGE_SIZE * 4, **only))
         days = int(await get_setting(db, "anomalies.review_days") or 14)
+    here = "/alerts/anomalies"
+    if source or resource:
+        here += "?" + urlencode({k: v for k, v in only.items() if v})
     tz = fmt.zone(session.get("tz"))
     to_review = [{"v": v} for v in to_review]
     past = [{"v": v} for v in past]
@@ -300,7 +309,7 @@ async def anomalies():
     mark_day_groups(to_review, tz, at=at)
     mark_day_groups(past, tz, at=at)
     return await render_template("alerts/anomalies.html", to_review=to_review, past=past,
-                                 review_days=days)
+                                 review_days=days, source=source, resource=resource, here=here)
 
 
 @alerts_bp.post("/anomalies/<anomaly_id>/review")