Avoid custom drag data type

server/public/app.js

@@ -242,8 +242,11 @@ function renderExplorer(body, win) {
     });
     row.addEventListener('dragstart', (event) => {
       state.draggedEntry = { path: entry.path, name: entry.name, sourceWindowId: win.id };
-      event.dataTransfer.setData('application/x-u-navigator-path', entry.path);
-      event.dataTransfer.setData('text/plain', entry.path);
+      try {
+        event.dataTransfer.setData('text/plain', entry.path);
+      } catch {
+        // Some WebKit builds reject programmatic drag data. App state is the primary channel.
+      }
       event.dataTransfer.effectAllowed = 'copyMove';
       row.classList.add('dragging');
     });
@@ -359,7 +362,7 @@ async function handleDrop(event, win, targetPath) {
     return;
   }
 
-  const internalPath = event.dataTransfer.getData('application/x-u-navigator-path') || event.dataTransfer.getData('text/plain') || state.draggedEntry?.path;
+  const internalPath = state.draggedEntry?.path || safeGetDragText(event);
   if (internalPath) {
     const name = internalPath.split('/').filter(Boolean).at(-1);
     const destination = `${targetPath.replace(/\/$/, '')}/${name}`;
@@ -402,7 +405,7 @@ async function reloadExplorerWindows(ids) {
 }
 
 function hasDropPayload(event) {
-  return Boolean(state.draggedEntry || event.dataTransfer?.types?.includes('Files') || event.dataTransfer?.types?.includes('application/x-u-navigator-path') || event.dataTransfer?.types?.includes('text/plain'));
+  return Boolean(state.draggedEntry || event.dataTransfer?.types?.includes('Files') || event.dataTransfer?.types?.includes('text/plain'));
 }
 
 function showError(error) {
@@ -410,6 +413,14 @@ function showError(error) {
   alert(message);
 }
 
+function safeGetDragText(event) {
+  try {
+    return event.dataTransfer.getData('text/plain');
+  } catch {
+    return '';
+  }
+}
+
 async function renameEntry(win, entry) {
   const nextName = prompt('Neuer Name', entry.name);
   if (!nextName || nextName === entry.name) {