Olivero: Update styles for unpublished nodes

Added padding and max-width to the image inside the node so it doesn't break. Attached before after screenshot.

I think we need to find a different way to indicate that a viewed node is unpublished.

What was agreed upon to do that?

Will need approval from olivero maintainer also.

1. Missing paddings on the highlighted node container.
2. The article image sticks out of the highlighted area.

The padding of unpublished nodes matches the padding of published nodes, and the article images are supposed to overflow the boundaries, per the design. We don't really want published/unpublished nodes to be dramatically visually different. I'm not opposed to finding a better "less weird" set of styles, but unless there's a real usability issue that warrants it, I don't think this ticket is really worth pursuing.