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Replace the getPopoverHtml string template and innerHTML assignment with DOM construction (createElement/setAttribute/toggleAttribute), removing the innerHTML sink in KSLAddButtonElement. Also validate the add button permissions response received over postMessage before use. The payload crosses a trust boundary with no enforced origin, so parseAddButtonPermissionsResponse now rejects any unexpected shape instead of trusting its declared type at runtime.
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Motivation
Which issue does this fix? Fixes #
issue numberIf no issue exists, what is the fix or new feature? Were there any reasons to fix/implement things that are not obvious?
Checklist
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