Enabled clipboard access for copy links

[girishpanchal30]

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Changes proposed in this Pull Request:

Enabled clipboard access for the Optimole DAM iframe to allow copy functionality.

Closes #1086

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[Copilot]

Pull request overview

This PR fixes a regression (issue #1086) where the "Copy Link" button inside the Optimole Cloud Library DAM integration silently failed to copy asset URLs to the clipboard. Because the DAM UI is rendered in a cross-origin iframe (https://dashboard.optimole.com/dam), the Clipboard API is blocked unless the embedding page explicitly delegates the permission. The fix adds the allow="clipboard-read; clipboard-write" attribute to the DAM iframe so clipboard access is granted in both the standalone Cloud Library admin page and the WordPress media modal, which share the same render_dashboard_page() markup.

Changes:

• Added allow="clipboard-read; clipboard-write" to the #om-dam iframe to enable Clipboard API access for the cross-origin DAM UI.

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