fix(documents): FolderActionsMenu — disable on pending + skip no-op rename

Pass loading={deleteMutation.isPending} to ConfirmationDialog so a
second tap on Delete doesn't dispatch a concurrent DELETE. Also
disable the rename Save button when the name hasn't changed, so an
accidental click doesn't fire a no-op PATCH and a misleading
"Folder renamed" toast.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/documents/folder-actions-menu.tsx

@@ -104,6 +104,7 @@ export function FolderActionsMenu({ selectedFolderId, onAfterDelete }: FolderAct
                 title="Delete folder?"
                 description="Subfolders and documents inside will move up to the parent. The folder itself is removed."
                 confirmLabel="Delete folder"
+                loading={deleteMutation.isPending}
                 onConfirm={async () => {
                   try {
                     await deleteMutation.mutateAsync(selectedFolderId as string);
@@ -181,7 +182,9 @@ export function FolderActionsMenu({ selectedFolderId, onAfterDelete }: FolderAct
               Cancel
             </Button>
             <Button
-              disabled={!name.trim() || renameMutation.isPending}
+              disabled={
+                !name.trim() || name.trim() === currentName || renameMutation.isPending
+              }
               onClick={async () => {
                 try {
                   await renameMutation.mutateAsync({