Dynamic resolved count, host search filter, lt-divider for UniFi section

- db.py: add resolved_24h to get_status_summary() so each /api/status
  poll carries the fresh 24h resolved count
- app.js: wire stat-resolved-val to update from summary.resolved_24h
  so the Resolved 24h card stays accurate after auto-refresh
- index.html: add lt-toolbar/lt-search above host grid for quick
  client-side host filtering by name
- links.html: replace custom unifi-section-header div with lt-divider
- style.css: remove unused .unifi-section-header rules

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

templates/links.html

@@ -358,7 +358,7 @@ function renderUnifiSwitches(unifiSwitches, dataUpdated) {
       </div>`;
   }).join('');
 
-  return `<div class="unifi-section-header">UNIFI SWITCH PORTS</div>${html}`;
+  return `<div class="lt-divider" style="margin:20px 0 12px"><span class="lt-divider-label" style="color:var(--cyan);letter-spacing:.1em">UNIFI SWITCH PORTS</span></div>${html}`;
 }
 
 // ── Panel collapse / expand ───────────────────────────────────────