Signing key activity logs and smoother asset handling

This release adds Activity Log entries for signing key changes, alongside improvements to folder-scoped asset deletion and full-screen previews for private images.

Media Library now records signing key creation and revocation in your organization’s Activity Log, including the person who initiated the change. This gives administrators a clear audit trail for keys used to generate authenticated asset URLs.

• Deleting assets from folders now works smoothly for roles scoped to a root folder, and folder views refresh immediately to reflect the change.
• Private images now load reliably in full-screen preview, with clearer feedback if an image can’t be displayed.