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/renderer/env.d.ts

@@ -64,7 +64,12 @@ declare global {
           },
         ): Promise<null>
         onRuntimeInvalidated(
-          listener: (event: { reason: 'account-health'; at: number; accountId?: string }) => void,
+          listener: (event: {
+            reason: 'account-health' | 'publish-task-lease'
+            at: number
+            accountId?: string
+            taskId?: string
+          }) => void,
         ): () => void
         onNetworkObserved(listener: (event: DesktopObservedRequest) => void): () => void
       }