[R1shabh-Gupta]

In the theme installer (wp-admin/theme-install.php), themes that are incompatible with the current WordPress or PHP version have their action buttons disabled, but clicking anywhere else on the theme card still opened the theme preview.

This PR:

• Bails early in the card's preview handler when the theme is incompatible, so clicking, tapping, or pressing Enter on the card no longer opens the preview.
• Removes the "Details & Preview" hover label, pointer cursor, and hover dimming from incompatible cards, so they no longer look clickable.
• Makes the Next/Previous arrows (and Alt + arrow keys) in the preview overlay skip incompatible themes.
• Bails early in the preview route handler when the requested theme can't be previewed or isn't in the current collection, so the browser's Back/Forward buttons can't leave the overlay unresponsive.

As a side effect, the links in the card's compatibility notice (e.g. "Please update WordPress") now work. Previously the preview handler prevented their default action.

Trac ticket: https://core.trac.wordpress.org/ticket/66256

Use of AI Tools

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