v0.169.0: disk-health card + degradation notification (Lemezek állapota)

Consumes the agent v0.94.0 smart payload (MinAgent floor unchanged; feature-detect
by presence). One pure verdict fn agentapi.DiskVerdictFor shared by the dashboard
card and the 6h check. Card via a 60s /disks TTL cache (anti-smartctl-storm);
unreachable agent -> Nincs adat, page never blocks. disk-health-check (6h) emits
disk_health_degraded on a degradation only vs an in-memory baseline (first run
silent, recovery/UNKNOWN never notify, multi-attr -> one event). No global banner
(deliberate). Pairs with the hub allowlist bump.

Tests: verdict table (>=90 red-proof), notifier emit, check first-run-silent
(red-proof), degradation-once, recovery-silent, UNKNOWN-excluded, FAILING-critical,
nil-smart card, TTL cache.

controller/internal/web/templates/dashboard.html

@@ -110,6 +110,23 @@
 </div>
 {{end}}
 
+<div class="disk-health-card">
+    <h3>Lemezek állapota</h3>
+    {{if .DiskHealthRows}}
+    <ul class="disk-health-list">
+        {{range .DiskHealthRows}}
+        <li class="disk-health-row">
+            <span class="disk-health-label">{{.Label}}</span>
+            <span class="disk-health-status {{.ChipClass}}">{{.ChipLabel}}</span>
+            {{if .Temp}}<span class="disk-health-temp">{{.Temp}} °C</span>{{end}}
+        </li>
+        {{end}}
+    </ul>
+    {{else}}
+    <p class="form-hint state-text-neutral">Nincs adat</p>
+    {{end}}
+</div>
+
 {{if .BackupEnabled}}
 <div class="backup-status-card">
     <h3><a href="/backups" class="backup-card-link">Biztonsági mentés</a></h3>

controller/internal/web/templates/style.css

@@ -1552,6 +1552,28 @@ a.stat-card:hover {
     border: 1px solid var(--line);
     margin-bottom: 2rem;
 }
+/* Disk-health card (v0.169.0) — same card grammar as the backup card. */
+.disk-health-card {
+    background: var(--bg-1);
+    border-radius: var(--radius);
+    padding: 1rem 1.25rem;
+    border: 1px solid var(--line);
+    margin-bottom: 2rem;
+}
+.disk-health-card h3 { margin-bottom: .75rem; }
+.disk-health-list { list-style: none; padding: 0; margin: 0; }
+.disk-health-row {
+    display: flex;
+    align-items: center;
+    gap: .75rem;
+    padding: .35rem 0;
+    font-size: .85rem;
+    border-top: 1px solid var(--line);
+}
+.disk-health-row:first-child { border-top: none; }
+.disk-health-label { flex: 1; color: var(--text-1); }
+.disk-health-status { font-weight: 600; }
+.disk-health-temp { color: var(--text-3); font-variant-numeric: tabular-nums; }
 .backup-status-card h3 {
     margin-bottom: .75rem;
 }