[UEPR-488] Make Sprite selector items fully navigable via keyboard

[kbangelov]

Resolves

https://scratchfoundation.atlassian.net/browse/UEPR-488

Proposed Changes

• Makes sprite item and delete button for it respond to "Enter" like they do on click.
• Improved semantics.
• Added default focus on delete button prompt open.
• Added better aria-label for sprite item that contains name and details.

Reason for Changes

Part of accessibility initiative for Scratch.

[Copilot]

Pull request overview

Enables full keyboard navigation/activation for sprite selector items and related controls, improving accessibility semantics and focus management.

Changes:

• Replaced sprite item wrapper with a <button> and added an aria-label including sprite metadata.
• Added key handling for Enter/Space on sprite items and delete buttons.
• Auto-focuses the “Yes/OK” button when the delete confirmation prompt opens.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
packages/scratch-gui/src/components/sprite-selector-item/sprite-selector-item.jsx	Converts sprite item to a button, adds aria-label and keyboard handling
packages/scratch-gui/src/components/sprite-selector-item/sprite-selector-item.css	Removes default button styling to preserve existing visuals
packages/scratch-gui/src/components/delete-confirmation-prompt/delete-confirmation-prompt.jsx	Adds default focus to confirmation button on mount
packages/scratch-gui/src/components/delete-button/delete-button.jsx	Adds keyboard handling for Enter/Space on delete control

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[adzhindzhi]

Left two minor comments, but otherwise looks good to me! 🙌

[adzhindzhi]

Looks good! 🙌