Richer detection/insertion of links in composer

[Bossett]

Is your feature request related to a problem? Please describe.

Facets are currently underutilised in the composer, with hashtags, mentions, and links having limited expression.

Describe the solution you'd like

When adding a link, a popover should appear similar to the @ mention popover - and allow choosing from options such as:

1. Insert title, which pulls in the website's title, and allows a user to then edit the name (preferably in the composer, but maybe in the popover?)
2. Embed, removing the link and embedding - eliminating the need to backspace if you just want the link card
3. Shortened link, current behaviour, but show the link as shortened in the composer, letting people edit as per 1
4. Full link

The popover should show a placeholder until the user clicks/taps - which should be the prompt to go off and grab the website data.

In the future, that could extend to special detections (i.e. of bsky links) to include 5. <site specific data, like 'article title' or 'author name' (useful in doi links)> for even richer links, and if you're querying you can also pull in canonical URLs if it's in the metadata without session, etc. info, further cleaning things up.