fix(note-block): add required src attribute to track elements

HTML spec requires track elements to have a src attribute.

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

Author: waleedlatif1

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

@@ -433,12 +433,12 @@ const NoteMarkdown = memo(function NoteMarkdown({ content }: { content: string }
                       preload='metadata'
                       className='aspect-video w-full'
                     >
-                      <track kind='captions' default />
+                      <track kind='captions' src='' default />
                     </video>
                   )}
                   {embedInfo.type === 'audio' && (
                     <audio src={embedInfo.url} controls preload='metadata' className='w-full'>
-                      <track kind='captions' default />
+                      <track kind='captions' src='' default />
                     </audio>
                   )}
                 </span>