feat: Hide queue summary until items are added

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

frontend/app.js

@@ -136,6 +136,11 @@ function render(){
     });
   } catch {}
 
+  const summaryEl = document.getElementById('summary');
+  if (summaryEl) {
+    summaryEl.classList.toggle('hidden', items.length === 0);
+  }
+
   const c = {queued:0,uploading:0,done:0,dup:0,err:0};
   for(const it of items){
     if(['queued','checking'].includes(it.status)) c.queued++;