Focus NVDA window when block action code context fires

[coderabbitai]

Description

When the block action code context fires, preventing an action while dialogs require a response, it should ensure that any top-level NVDA window is focused. This will help users understand that a response is required before performing other actions.

References

• PR: "Action unavailable while a dialog requires a response" when trying to do anything while add-on update dialog displayed #16923
• Comment: "Action unavailable while a dialog requires a response" when trying to do anything while add-on update dialog displayed #16923 (comment)

Assignee

@seanbudd