feat(plugins): Traefik problems first, UniFi/SNMP/fleet on shared shapes, audit names its entities, templates on tokens (#5126)

Traefik: routers are graded from their latest scrape (router_state: crit on
any real 5xx share, warn on p95 past the latency critical cutoff or a high
4xx share). Failing and slow routers lead as cards that say why; healthy
ones fold into one table that stays open or shut across polls. Proxy
counts are stat tiles; certificates are graded by Settings -> Thresholds
(tls_days).

UniFi: WAN health is a stat strip (latency graded by the thresholds),
devices carry status dots, event categories and firewall actions are
badges, the alarm count reuses .count-badge (renamed from .nav-count).
SNMP: each device wears a status badge and its readings are stat tiles.

Agent fleet: the table comes first, with a Status column (Reporting /
Silent / Never reported, by the host page's stale_after_seconds), silent
agents first, hosts linked, last seen as |ago.

Audit: entries name their entity (one query per type, steward/audit/
service.py) and link it; something deleted since keeps the name its entry
recorded and says "(deleted)".

Tokens: charts read colours through chart-colors.js (stewardColor resolves
a token to the rgb the browser computed; Chart.js defaults take the page's
text and border colours), so host, history, Traefik and SNMP charts drop
their hex. Template hex colours reach 0 (HEX_CEILING = 0), the last rgba
pills go, and heavy weights (600/700/bold, 60 of them) become 500, the
house pair being 400/500; a guard keeps templates there.

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

steward/templates/audit/list.html

@@ -1,25 +1,25 @@
 {% extends "base.html" %}
-{% block title %}Audit Log — Steward{% endblock %}
+{% from "_macros.html" import page_header, empty_state %}
+{% block title %}Audit log — Steward{% endblock %}
 {% block content %}
-<div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;">
-  <h1 class="page-title" style="margin-bottom:0;">Audit Log</h1>
+{% call page_header("Audit log", "Who changed what, newest first.") %}
   <form method="get" style="display:flex;gap:0.5rem;align-items:center;">
     <input type="text" name="action" value="{{ action_filter }}"
-           placeholder="Filter by action…"
+           placeholder="Filter by action…" aria-label="Filter by action"
            style="width:200px;font-size:0.85rem;">
     <button type="submit" class="btn btn-ghost btn-sm">Filter</button>
     {% if action_filter %}
     <a href="/audit/" class="btn btn-ghost btn-sm">Clear</a>
     {% endif %}
   </form>
-</div>
+{% endcall %}
 
 {% if events %}
 <div class="card-flush">
   <table class="table">
     <thead>
       <tr>
-        <th style="min-width:160px;">Time (UTC)</th>
+        <th>When</th>
         <th>User</th>
         <th>Action</th>
         <th>Entity</th>
@@ -31,30 +31,21 @@
       {% set e = item.event %}
       {% set d = item.detail %}
       <tr>
-        <td style="font-family:ui-monospace,monospace;font-size:0.8rem;white-space:nowrap;color:var(--text-muted);">
-          {{ e.timestamp.strftime("%Y-%m-%d %H:%M:%S") }}
-        </td>
+        <td style="white-space:nowrap;" title="{{ e.timestamp.strftime('%Y-%m-%d %H:%M:%S UTC') }}">{{ e.timestamp|ago }}</td>
         <td style="font-size:0.85rem;">{{ e.username }}</td>
+        <td><span class="mono">{{ e.action }}</span></td>
         <td>
-          {% set cat = e.action.split('.')[0] %}
-          <span style="
-            font-size:0.78rem;font-family:ui-monospace,monospace;
-            padding:0.15rem 0.4rem;border-radius:3px;
-            background:{% if cat == 'auth' %}var(--bg-elevated){% elif cat == 'plugin' %}var(--gold-dim){% elif cat == 'alert' %}var(--red-dim){% elif cat == 'host' %}var(--green-dim){% elif cat == 'settings' %}var(--bg-elevated){% else %}var(--bg-elevated){% endif %};
-            color:{% if cat == 'auth' %}var(--accent){% elif cat == 'plugin' %}var(--gold){% elif cat == 'alert' %}var(--red){% elif cat == 'host' %}var(--green){% elif cat == 'settings' %}var(--text-muted){% else %}var(--text-muted){% endif %};">
-            {{ e.action }}
-          </span>
-        </td>
-        <td style="font-size:0.82rem;color:var(--text-muted);">
-          {% if e.entity_type %}
-          <span style="color:var(--text-dim);">{{ e.entity_type }}/</span>{{ e.entity_id or "" }}
-          {% endif %}
+          {% if item.entity %}
+          <span class="field-hint">{{ e.entity_type|replace('_', ' ') }}</span>
+          {% if item.entity.url %}<a href="{{ item.entity.url }}">{{ item.entity.label }}</a>{% else %}{{ item.entity.label }}{% endif %}
+          {% if item.entity.gone %}<span class="field-hint">(deleted)</span>{% endif %}
+          {% elif e.entity_type %}<span class="field-hint">{{ e.entity_type|replace('_', ' ') }}</span>{% endif %}
         </td>
         <td style="font-size:0.8rem;color:var(--text-muted);max-width:340px;">
           {% if d %}
           {% for k, v in d.items() %}
           <span style="color:var(--text-dim);">{{ k }}:</span>
-          <span style="font-family:ui-monospace,monospace;">{{ v }}</span>
+          <span class="mono">{{ v }}</span>
           {% if not loop.last %} &nbsp;·&nbsp; {% endif %}
           {% endfor %}
           {% endif %}
@@ -71,8 +62,6 @@
   {% endif %}
 </p>
 {% else %}
-<div class="card" style="text-align:center;padding:3rem;">
-  <p style="color:var(--text-muted);">No audit events recorded yet.</p>
-</div>
+<div class="card">{{ empty_state("No audit events recorded yet.") }}</div>
 {% endif %}
 {% endblock %}