jobs: Stop now cancels queued jobs; add remove/stop button on list rows

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/servers/api/tasks/pipeline-jobs-routes.ts

@@ -98,13 +98,13 @@ pipelineJobsRouter.get('/:id/log', async (c) => {
   }
 });
 
-// POST /:id/stop — request cancellation (cooperative abort).
+// POST /:id/stop — stop a running job or cancel a queued one.
 pipelineJobsRouter.post('/:id/stop', async (c) => {
   const user = c.get('user');
   const job = await getPipelineJob(c.req.param('id'));
   if (!job || job.userId !== user.id) return c.json({ error: 'Not found' }, 404);
-  const stopped = jobManager.stopJob(job.id);
-  return c.json({ ok: true, wasLive: stopped });
+  const result = await jobManager.requestStop(job.id);
+  return c.json({ ok: true, result });
 });
 
 // GET /:id — single job detail (full row).