feat: add abort button for job cancellation

templates/status.html

@@ -8,6 +8,7 @@
       <span class="status-badge badge badge-{{ 'info' if job.status.name == 'RUNNING' else 'warning' if job.status.name == 'PENDING' else 'success' if job.status.name == 'COMPLETED' else 'error' if job.status.name == 'FAILED' else 'neutral' }}" id="status-badge">
         {{ job.status.name }}
       </span>
+      <button class="btn btn-danger btn-sm" id="cancel-btn" style="display:{{ 'inline-flex' if job.status.name in ('PENDING', 'RUNNING') else 'none' }}" aria-label="Abort this job">Abort</button>
       <time class="status-time" id="created-time" datetime="{{ job.created_at }}">{{ job.created_at | int }}</time>
     </div>
     <h2 class="job-id" id="job-title">Job {{ job.job_id[:8] }}...</h2>