ui: use hidden state for wizard streaming panels

apps/ui/js/wizard.js

@@ -1718,7 +1718,7 @@ function updateStreamingConfigVisibility() {
     if (!node) return;
     var group = node.closest('.form-group') || node.closest('.checkbox-pill');
     if (group) {
-      group.style.display = isUnary ? 'none' : '';
+      group.hidden = isUnary;
     }
   });
 
@@ -1732,8 +1732,8 @@ function updateStreamingConfigVisibility() {
           : tKey('wizard.streaming.help.window')));
   }
 
-  if (toolFamily) toolFamily.style.display = (isSession || isAsyncJob) ? '' : 'none';
-  if (asyncRow) asyncRow.style.display = isAsyncJob ? '' : 'none';
+  if (toolFamily) toolFamily.hidden = !(isSession || isAsyncJob);
+  if (asyncRow) asyncRow.hidden = !isAsyncJob;
 
   ensureStreamingToolFamilyDefaults(mode);
 }
@@ -2213,7 +2213,7 @@ async function runWizardLiveAction(button, busyLabel, handler) {
 
 function updateWizardProtocolVisibility() {
   var grpcTools = document.getElementById('wizard-grpc-live-tools');
-  if (grpcTools) grpcTools.style.display = wizardProtocol === 'grpc' ? '' : 'none';
+  if (grpcTools) grpcTools.hidden = wizardProtocol !== 'grpc';
   updateStreamingModeOptions();
   updateStreamingConfigVisibility();
 }
@@ -2225,7 +2225,7 @@ function showWizardLiveStatus(title, text, isError) {
   if (!root || !titleEl || !textEl) return;
   titleEl.textContent = title;
   textEl.textContent = text;
-  root.style.display = '';
+  root.hidden = false;
   root.classList.toggle('is-error', !!isError);
   root.classList.toggle('is-success', !isError);
 }