Feature: show suppression status on active alert rows

Active events now carry an is_suppressed boolean (added in api_status()
and the index() route via check_suppressed() against the pre-loaded
suppression list). The events table renders a muted '🔕 sup' badge next
to the severity and dims the entire row (.row-suppressed) so operators
can immediately see which firing alerts are silenced.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/index.html

@@ -111,8 +111,11 @@
         <tbody>
           {% for e in events %}
           {% if e.severity != 'info' %}
-          <tr class="row-{{ e.severity }}">
-            <td><span class="lt-badge badge-{{ e.severity }}">{{ e.severity }}</span></td>
+          <tr class="row-{{ e.severity }}{% if e.is_suppressed %} row-suppressed{% endif %}">
+            <td>
+              <span class="lt-badge badge-{{ e.severity }}">{{ e.severity }}</span>
+              {% if e.is_suppressed %}<span class="lt-badge badge-suppressed" title="Alert suppressed">🔕 sup</span>{% endif %}
+            </td>
             <td>{{ e.event_type | replace('_', ' ') }}</td>
             <td><strong>{{ e.target_name }}</strong></td>
             <td>{{ e.target_detail or '–' }}</td>