preview AP objects as quotes - fix #595

What does this MR do?

This teaches MkUrlPreview to use the activityPub element returned by Summaly. If it's present, we fetch whatever it points to, and if it's a note, we show it as if it were a normal quoted note.

A note containing such a URL ends up looking like this:

A note containing the same URL, but also actually quoting the note, only shows the real quote, not the preview-quote, because we're already filtering such duplicate URLs.

Of course if a note is a quote-renote and contains a URL to another note, we'll show both:

If we decide this is a bad idea, we could do <MkUrlPreview … :showAsQuote="!appearNote.renote"

A note containing a link to an AP object that's not a note looks normal:

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requested review from @CenTdemeern1, @fEmber, @Marie, @luna, and @tess

Does this support multiple links in one note?

Does it support "web URL" stuff like Mastodon, or does it have to be an AP URL?

I propose that we use the variable "divider" for the style here, as that's what is used within the MkUrlPreview class. var(--divider); (although this is not what i got from vue rather just viewing transfem.social live so i am not sure what the vue variable is).

since @puppygirlhornypost asked, I've changed the style:

first is a MkUrlPreview (styled like other URL previews), second is a real quote

regular preview:

embedded note preview:

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• 2dfadc08 - style embedded note previews like normal previews

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• c52badee - only log preview error in dev mode

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approved this merge request

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• 5fd3e271 - only log preview error in dev mode

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mentioned in commit fcbf072e

merged