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>

plugins/snmp/templates/snmp/device.html

@@ -9,9 +9,7 @@
   <span style="font-size:0.8rem;color:var(--text-dim);">{{ device.host }}</span>
   <div style="margin-left:auto;display:flex;gap:0.5rem;">
     {% for h in [1, 6, 24, 168] %}
-    <a href="?hours={{ h }}"
-       class="btn btn-ghost"
-       style="font-size:0.78rem;padding:0.2rem 0.6rem;{% if hours == h %}background:var(--accent);color:#fff;border-color:var(--accent);{% endif %}">
+    <a href="?hours={{ h }}" class="range-btn{% if hours == h %} active{% endif %}"{% if hours == h %} aria-current="true"{% endif %}>
       {% if h < 24 %}{{ h }}h{% elif h == 24 %}24h{% else %}7d{% endif %}
     </a>
     {% endfor %}
@@ -27,7 +25,8 @@
 (function(){
   const raw = {{ history_json | safe }};
   const labels = {{ oid_labels | tojson }};
-  const palette = ["#6060c0","#e07040","#40b080","#c040c0","#4080e0","#e0c040","#c08040"];
+  // Series colours from the tokens, in an order that keeps neighbours apart.
+  const palette = ["--blue", "--yellow", "--green", "--red", "--gold", "--orange", "--text-muted"].map(stewardColor);
 
   // Collect all unique timestamps, sorted
   const tsSet = new Set();
@@ -66,12 +65,10 @@
       responsive: true,
       interaction: { mode: "index", intersect: false },
       plugins: {
-        legend: { position: "top", labels: { color: "#aaa", boxWidth: 12 } },
-        tooltip: { backgroundColor: "#1e1e2e", titleColor: "#ccc", bodyColor: "#aaa" },
+        legend: { position: "top", labels: { boxWidth: 12 } },
       },
       scales: {
-        x: { ticks: { color: "#888", maxTicksLimit: 12 }, grid: { color: "#2a2a3a" } },
-        y: { ticks: { color: "#888" }, grid: { color: "#2a2a3a" } },
+        x: { ticks: { maxTicksLimit: 12 } },
       },
     },
   });