Add focus-visible style for marketplace grid item selection

[Chucks1093]

Summary
Marketplace grid items lack a distinct focus-visible style, making keyboard navigation through the grid invisible. A focused grid item should show a clear indicator consistent with the rest of the UI focus ring system.

Scope

• locate the marketplace grid item component
• apply a focus-visible style using the project focus ring token or convention
• verify the style appears only on keyboard focus and not on mouse click

Acceptance Criteria

• keyboard focus on a grid item shows a visible focus ring
• mouse click on a grid item does not show the focus ring
• the style is consistent with focus rings used elsewhere in the UI

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[oscar24357]

@oscar24357 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would love to work on this issue, Please can you assign me to it, thank you!

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[N-i-xx]

@N-i-xx has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Dear maintainer
Please assign me this issue

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[extolkom]

@extolkom has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Please assign me

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[Benedict315]

@Benedict315 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello I would like to work on this issue

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@N-i-xx's PR #512 was approved and merged by @Chucks1093.

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👏 Great work, @N-i-xx! Keep contributing to accesslayerorg.

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