fix(block-menu): paste should not be disabled for locked selection

Paste creates new blocks, doesn't modify selected ones. Changed from
disableEdit (includes lock state) to !userCanEdit (permission only),
matching the Duplicate action behavior.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/block-menu/block-menu.tsx

@@ -164,7 +164,7 @@ export function BlockMenu({
         </PopoverItem>
         <PopoverItem
           className='group'
-          disabled={disableEdit || !hasClipboard}
+          disabled={!userCanEdit || !hasClipboard}
           onClick={() => {
             onPaste()
             onClose()