Function getLastReadTimestamp

tests/ui/chat/unreadIndicator.test.ts:43–45

* Get the lastReadTimestamp from persisted state.

(workspaceId: string)

 * Get the lastReadTimestamp from persisted state.
 */
function getLastReadTimestamp(workspaceId: string): number {
  return readPersistedState<number>(getWorkspaceLastReadKey(workspaceId), 0);
}

/**
 * Find the workspace element in the sidebar and check if it shows the unread indicator.