add pipeline job management with /jobs pages and per-step output viewer

- Pipeline jobs now persist to DB with progress tracking and cost accumulation
- Jobs survive WebSocket disconnects with in-memory event buffer replay
- New /jobs list page with search, status badges, and cost display
- New /jobs/:id detail page with live WebSocket attachment and REST fallback
- Two-column layout using WorkspaceLayout for resizable steps/output panels
- Streaming messages tagged with stepIndex/iterationLabel for per-step output grouping
- TaskRunnerModal links to job detail page once job is created
- Dock entry added for Jobs page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -0,0 +1,29 @@
+import { createRouter } from '../../create-router';
+import { getPipelineJobsForUser, getPipelineJob } from 'officerdb';
+
+export const pipelineJobsRouter = createRouter();
+
+// GET /pipeline-jobs — list user's pipeline jobs
+pipelineJobsRouter.get('/', async (c) => {
+  const user = c.get('user');
+  const jobs = await getPipelineJobsForUser(user.id);
+  return c.json(jobs.map((j) => ({
+    id: j.id,
+    taskDirName: j.taskDirName,
+    taskName: j.taskName,
+    status: j.status,
+    totalCost: j.totalCost,
+    createdAt: j.createdAt,
+    startedAt: j.startedAt,
+    completedAt: j.completedAt,
+    error: j.error,
+  })));
+});
+
+// GET /pipeline-jobs/:id — single job detail
+pipelineJobsRouter.get('/:id', 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);
+  return c.json(job);
+});