Preserve the original video/gif aspect ratio
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Closes #100 (closed)
Relies on the meta: {original: {width, height}}
attachment info provided by BE original-dimensions.diff as per Mastodon API https://docs.joinmastodon.org/methods/statuses/media/. This can be applied to the local media first and then perhaps federated the same way blurhash and focal point are federated (https://docs.joinmastodon.org/spec/activitypub/#extensions) for the remote media.