fix: the spinner by the path keeps its place, so the path field does not jump

internal/server/web/templates/files.html

@@ -23,11 +23,13 @@
   .fm-bar .fm-pathbox .btn.sq { position:absolute; right:4px; top:4px; width:26px; height:26px; border:1px solid transparent; }
   .fm-bar .fm-pathbox .btn.sq:hover { border-color:var(--border); background:#151a21; }
   .spinner { width:16px; height:16px; border:2px solid var(--border); border-top-color:var(--accent);
-             border-radius:50%; animation:spin .7s linear infinite; display:none; }
+             border-radius:50%; animation:spin .7s linear infinite; display:inline-block; flex:none; visibility:hidden; }
   @keyframes spin { to { transform:rotate(360deg); } }
   /* Busy indicator; while files upload it also shows how far they got, and a
-     click on it lists them. */
-  .busy { display:inline-flex; align-items:center; gap:6px; background:none; border:0; padding:0 4px;
+     click on it lists them. It holds its place, hidden or not, so the path
+     field beside it never jumps. */
+  #uppct:not(:empty) { min-width:9.5ch; }
+  .busy { flex:none; min-width:24px; justify-content:center; display:inline-flex; align-items:center; gap:6px; background:none; border:0; padding:0 4px;
           height:34px; color:var(--muted); font-size:13px; font-variant-numeric:tabular-nums; cursor:default; }
   .busy:hover { background:none; }
   .busy.up { cursor:pointer; color:var(--text); }
@@ -339,7 +341,8 @@
 (function () {
   const agentID = {{.Agent.ID}};
   let busyN = 0;
-  function setBusy(on) { busyN += on ? 1 : -1; if (busyN < 0) busyN = 0; document.getElementById('spin').style.display = busyN > 0 ? 'inline-block' : 'none'; }
+  // The spinner keeps its place when hidden, so the path field never jumps.
+  function setBusy(on) { busyN += on ? 1 : -1; if (busyN < 0) busyN = 0; document.getElementById('spin').style.visibility = busyN > 0 ? 'visible' : 'hidden'; }
   const api = (op, body) => {
     setBusy(true);
     return fetch('/api/panel/agents/' + encodeURIComponent(agentID) + '/fs/' + op, {