feat(desktop): add monitor scheduler, Playwright CDP layer, and account health

Move monitor-task scheduling authority onto the client with a durable
file-backed queue that survives restart, drops stale cross-day tasks,
enforces per-platform serialism, and adapts global concurrency from
Electron process metrics. Publish tasks keep their existing FIFO.

Add a hidden Playwright CDP manager that attaches to Electron Chromium
on account session partitions, lets adapters opt into `executionMode:
"playwright"`, and leaves the existing hidden WebContentsView path in
place for current adapters.

Introduce an account-health subsystem with silent probes, projected
health/auth states, and IPC invalidation events so the renderer can
show accurate auth/probe status and verification timestamps.

Server-side, derive and forward title/business_date/scheduler_group_key/
question_text metadata on desktop task events so the local scheduler
can defer same-question fan-out before leasing.

server/internal/tenant/app/publish_job_service.go

@@ -213,17 +213,22 @@ func (s *PublishJobService) Create(ctx context.Context, actor auth.Actor, req Cr
 	invalidateArticleCaches(ctx, s.cache, actor.TenantID, &articleID)
 
 	for _, task := range createdTasks {
+		title, businessDate, schedulerGroupKey, questionText := deriveDesktopTaskEventMetadataFromPayload(task.Kind, task.Payload)
 		if publishErr := publishDesktopTaskEvent(context.Background(), s.messaging, DesktopTaskEvent{
-			Type:            "task_available",
-			TaskID:          task.DesktopID.String(),
-			JobID:           task.JobID.String(),
-			WorkspaceID:     task.WorkspaceID,
-			TargetAccountID: task.TargetAccountID.String(),
-			TargetClientID:  task.TargetClientID.String(),
-			Platform:        task.Platform,
-			Status:          task.Status,
-			Kind:            task.Kind,
-			UpdatedAt:       task.UpdatedAt,
+			Type:              "task_available",
+			TaskID:            task.DesktopID.String(),
+			JobID:             task.JobID.String(),
+			WorkspaceID:       task.WorkspaceID,
+			TargetAccountID:   task.TargetAccountID.String(),
+			TargetClientID:    task.TargetClientID.String(),
+			Platform:          task.Platform,
+			Title:             title,
+			BusinessDate:      businessDate,
+			SchedulerGroupKey: schedulerGroupKey,
+			QuestionText:      questionText,
+			Status:            task.Status,
+			Kind:              task.Kind,
+			UpdatedAt:         task.UpdatedAt,
 		}); publishErr != nil {
 			s.logWarn("desktop task available event publish failed", publishErr, zap.String("task_id", task.DesktopID.String()))
 		}