Fixing A11y issues in screencast

[vidorteg]

Fixing 2 accessibility issues in screencast window:

• Refresh button was not reading the role
• Close infobar was not providing enough information for narrator.

[Copilot]

Pull Request Overview

This PR addresses accessibility issues in the screencast window by improving ARIA attributes for screen readers and assistive technologies.

• Added explicit role attribute to the refresh button to ensure proper accessibility support
• Enhanced the close button in the infobar with proper role and aria-label attributes for better screen reader experience

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/screencast/screencast.ts	Added role attribute to the reload button for accessibility
src/screencast/infobar.ts	Added role and aria-label attributes to the close button for improved screen reader support

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