feat(dashboard): Hosts widget worst first, load against cores, one home per fact (#5251)

The Hosts — Overview widget opens with a verdict ("VDNT-Util01: CPU high."
or "All 3 hosts healthy."), then one row per host under one header: CPU,
memory, disk / and load. Rows sort by host_glance: a down monitor, a
reading past critical, a quiet agent, a warning, then the healthy. Load
reads "16.8 / 8 cores", graded per core as Settings → Thresholds intends
(cores counted from the per-core CPU sub-resources, as on the host page).
A quiet agent's last figures are shown uncoloured, with when it last reported.

Ping and 24h uptime are gone from this widget: they belong to Monitors. So
are the unlabelled CPU sparkline and the 30-day uptime query it no longer
needs.

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

steward/templates/hosts/overview_widget.html

@@ -1,50 +1,43 @@
-{# Unified Hosts widget — monitor status + agent glance per host, links to the hub.
-   Name sits on its own line (never truncated); its data wraps beneath it, grouped
-   under the host. Prefer vertical growth over cramming a row. #}
-{% if hosts %}
-<div class="host-blocks">
-  {% for host in hosts %}
-  {% set hs = host_status.get(host.id) %}
-  {% set ut = uptime.get(host.id, {}) %}
-  {% set a = agent.get(host.name, {}) %}
-  {% set down = hs and hs.state == 'down' %}
-  {% set spark = cpu_sparks.get(host.name) %}
-  <div style="padding:0.5rem 0;border-bottom:1px solid var(--border);">
-    {# Line 1 — status dot + full host name (own line) + cpu trend #}
-    <div style="display:flex;align-items:center;gap:0.5rem;">
-      <span class="dot {% if down %}dot-down{% elif hs and hs.state == 'up' %}dot-up{% else %}dot-dim{% endif %}"
-            style="flex-shrink:0;"
-            title="{% if not hs %}no monitors{% else %}{{ hs.state }}{% endif %}"></span>
-      {% if session.user_id %}
-      <a href="/hosts/{{ host.id }}" style="font-weight:500;font-size:0.85rem;overflow-wrap:anywhere;">{{ host.name }}</a>
-      {% else %}
-      <span style="font-weight:500;font-size:0.85rem;overflow-wrap:anywhere;">{{ host.name }}</span>
-      {% endif %}
-    </div>
-    {# Line 2 — monitors + agent metrics; wraps instead of truncating #}
-    <div style="display:flex;flex-wrap:wrap;gap:0.25rem 0.9rem;margin-top:0.25rem;padding-left:1.1rem;
-                font-variant-numeric:tabular-nums;color:var(--text-muted);font-size:0.75rem;">
-      {% if hs and hs.latency_ms is not none %}
-      <span title="Latency" style="{{ threshold_style(hs.latency_ms, 'latency') }}"><span style="color:var(--text-dim);">ping</span> {{ "%.0f"|format(hs.latency_ms) }}ms</span>
-      {% endif %}
-      {% if ut.get('24h') is not none %}
-      <span title="Uptime 24h" style="{{ threshold_style(ut['24h'], 'uptime') }}"><span style="color:var(--text-dim);">24h</span> {{ "%.1f"|format(ut['24h']) }}%</span>
-      {% endif %}
-      {% if a %}
-      {% if a.get('cpu_pct') is not none %}<span title="CPU — value + last-hour trend" style="display:inline-flex;align-items:center;gap:0.3rem;{{ threshold_style(a.cpu_pct, 'cpu') }}"><span style="color:var(--text-dim);">cpu</span> {{ "%.0f"|format(a.cpu_pct) }}%{% if spark %}<span style="line-height:0;opacity:0.85;">{{ spark | safe }}</span>{% endif %}</span>{% endif %}
-      {% if a.get('mem_used_pct') is not none %}<span title="Memory" style="{{ threshold_style(a.mem_used_pct, 'mem') }}"><span style="color:var(--text-dim);">mem</span> {{ "%.0f"|format(a.mem_used_pct) }}%</span>{% endif %}
-      {% if a.get('disk_root') is not none %}<span title="Root filesystem (/)" style="{{ threshold_style(a.disk_root, 'disk') }}"><span style="color:var(--text-dim);">disk /</span> {{ "%.0f"|format(a.disk_root) }}%</span>{% endif %}
-      {% if a.get('load_1m') is not none %}<span title="Load average over 1 minute: processes running or waiting to run"><span style="color:var(--text-dim);">load</span> {{ "%.2f"|format(a.load_1m) }}</span>{% endif %}
-      {% if not a.fresh %}<span title="Agent data is stale" style="color:var(--yellow);">stale</span>{% endif %}
-      {% else %}
-      <span style="color:var(--text-dim);" title="No agent reporting">no agent</span>
-      {% endif %}
-    </div>
-  </div>
-  {% endfor %}
+{# hosts/overview_widget.html — the dashboard Hosts widget (#5251): a verdict,
+   then one row per host, worst first, with its resources under one header.
+   Load is shown against the host's cores and graded per core. Reachability
+   and uptime belong to the Monitors widget, so they aren't repeated here. #}
+{% from "_macros.html" import status_dot %}
+{% if not rows %}
+<div class="w-verdict" style="color:var(--text-muted);">
+  No hosts yet.{% if session.user_id %} <a href="/hosts/new">Add one →</a>{% endif %}
 </div>
 {% else %}
-<div class="empty" style="color:var(--text-muted);font-size:0.85rem;padding:0.5rem 0;">
-  No hosts yet. <a href="/hosts/new">Add one.</a>
+{% set problems = rows | selectattr("state", "in", ["down", "crit", "stale", "warn"]) | list %}
+<div class="w-verdict {{ 'tone-crit' if problems and problems[0].state in ['down', 'crit'] else ('tone-warn' if problems else 'tone-ok') }}">
+  {%- if not problems %}All {{ rows|length }} host{{ 's' if rows|length != 1 }} healthy.
+  {%- elif problems|length == 1 %}{% set p = problems[0] %}{{ p.host.name }}:
+    {% if p.state == 'down' %}a monitor is down.{% elif p.state == 'stale' %}its agent stopped reporting.{% else %}{{ p.worst[0] }} high.{% endif %}
+  {%- else %}{{ problems|length }} of {{ rows|length }} hosts need a look.{% endif -%}
 </div>
+<table class="w-table">
+  <colgroup><col><col style="width:3.6rem"><col style="width:3.6rem"><col style="width:3.6rem"><col style="width:6.5rem"></colgroup>
+  <thead><tr><th>Host</th><th>CPU</th><th>Mem</th><th>Disk /</th><th>Load</th></tr></thead>
+  <tbody>
+  {% for r in rows %}
+  {% set a = r.agent %}{% set fresh = a.get('fresh') %}
+  <tr>
+    <td class="w-name" title="{{ r.host.name }}">
+      {{- status_dot(r.state) -}}
+      {% if session.user_id %}<a href="/hosts/{{ r.host.id }}">{{ r.host.name }}</a>{% else %}{{ r.host.name }}{% endif %}
+      {%- if r.state == 'down' %}<span class="w-sub tone-crit">a monitor is down</span>
+      {%- elif r.state == 'stale' %}<span class="w-sub tone-warn">agent last reported {{ a.last_at|ago }}; figures are from then</span>
+      {%- elif not a %}<span class="w-sub">no agent</span>{% endif %}
+    </td>
+    {% for v, kind in ((a.get('cpu_pct'), 'cpu'), (a.get('mem_used_pct'), 'mem'), (a.get('disk_root'), 'disk')) %}
+    <td style="{{ threshold_style(v, kind) if fresh and v is not none }}">{% if v is none %}—{% else %}{{ "%.0f"|format(v) }}%{% endif %}</td>
+    {% endfor %}
+    <td style="{{ threshold_style(a.get('load_per_core'), 'load') if fresh and a.get('load_per_core') is not none }}"
+        title="{% if a.get('cores') %}Load over 1 minute on {{ a.cores }} cores: {{ a.load_per_core }}% of them busy or waiting{% endif %}">
+      {%- if a.get('load_1m') is none %}—{% elif a.get('cores') %}{{ "%.1f"|format(a.load_1m) }} / {{ a.cores }} cores{% else %}{{ "%.1f"|format(a.load_1m) }}{% endif -%}
+    </td>
+  </tr>
+  {% endfor %}
+  </tbody>
+</table>
 {% endif %}