fix: use future publish_time for shared state test

PUBLISHED_RECORD used a fixed past date that was before Date.now(),
causing lastModified > publishedAt and dialog showing 'stale' instead
of 'shared'. Use Date.now() + 60s to ensure publishedAt > lastModified.

browser_tests/tests/dialogs/shareWorkflowDialog.spec.ts

@@ -16,7 +16,7 @@ const PUBLISHED_RECORD: PublishRecord = {
   workflow_id: 'wf-1',
   share_id: 'share-abc',
   listed: false,
-  publish_time: '2026-01-15T00:00:00Z'
+  publish_time: new Date(Date.now() + 60_000).toISOString()
 }
 
 const PRIVATE_ASSET: AssetInfo = {