feat(desktop): refresh publish tasks instantly on lease activation

Emit a 'publish-task-lease' runtime invalidation event whenever the
scheduler activates a publish task, and have PublishManagementView
listen for it to trigger an immediate refresh. The view also switches
to a 5s active-task poll only while a task is in_progress, replacing
the unconditional 20s timer.

apps/desktop-client/src/main/runtime-controller.ts

@@ -84,7 +84,7 @@ import {
   notePublishTaskLeaseMiss,
   selectNextPublishTask,
 } from './publish-scheduler'
-import { onRuntimeInvalidated } from './runtime-events'
+import { emitRuntimeInvalidated, onRuntimeInvalidated } from './runtime-events'
 import {
   initScheduler,
   noteSchedulerAccountsSync,
@@ -2426,6 +2426,7 @@ async function executeLeasedTask(
     noteMonitorTaskLeased(task, routing)
   } else {
     notePublishTaskActivated(taskRecord.id, taskRecord.platform)
+    emitRuntimeInvalidated('publish-task-lease', { taskId: taskRecord.id })
   }
   syncSchedulerSurface()
   queueMicrotask(() => pumpExecutionLoop())