Changing the metadata filepath to /oauth-client-metadata.json to display only the app domain helps with the OAuth Authorization page and in the Account page (where users can manage OAuth access, it's '{PDS URL}/account' or 'bsky.social/account').
Rocksky currently shows up like this 
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It's possible to adjust the name and name too. A thread for reference that could help figure it out, since there is no clear documentation: