maintenance page: hero uses the full-res photo (640px thumb upscaled blurry)

app.py

@@ -457,7 +457,7 @@ fetch("team.json").then(r=>r.ok?r.json():[]).then(items=>{
   const hero=document.getElementById("hero"),g=document.getElementById("grid");
   items.forEach((it,i)=>{
     const im=document.createElement("img");
-    im.src=it.thumb;im.alt=it.name;im.loading="lazy";
+    im.src=i===0?it.full:it.thumb;im.alt=it.name;im.loading="lazy";
     im.onclick=()=>{lbImg.src=it.full;lb.classList.add("show");};
     (i===0?hero:g).appendChild(im);
   });