feat: add queue summary panel

web/index.html

@@ -272,6 +272,7 @@
             <div class="list-head"><span class="grp-title">Detected carriers</span><span class="count-pill" id="signalCountBadge">0 live</span></div>
             <div class="signal-list" id="signalList"><div class="empty-state">No live signals yet.</div></div>
             <div class="panel-sub" id="signalDecisionSummary">Decision: -</div>
+            <div class="panel-sub" id="signalQueueSummary">Queue: -</div>
             <div class="field-pair">
               <label class="field"><span>Listen sec</span><input id="listenSeconds" type="number" min="1" max="10" step="1" value="2" /></label>
               <label class="field"><span>Listen mode</span>