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There are two modules that apply Claro's media library styles in another theme.
View Claro Media Library in all themes on Drupal.orgClaro Media Library in all themes (463 installs)
View Media Library Theme Reset on Drupal.orgMedia Library Theme ResetCovered by the Drupal security advisory policy (6,493 installs)
Both require Claro to be enabled, but don't mention it.
Copying the Claro styles into Mantra would set up a good starting point for further customization, and allow uninstalling Claro and these modules.