Make it more obvious that a URL gets removed for Bsky/LinkedIn

This is a follow-up to

https://justcrosspost.featurebase.app/p/automatically-remove-a-link-thats-used-for-embedded-link-cards

When you paste a URL, a little dropdown tooltip should show up like in Notion asking you what you want to do with that URL. Options will be:

• Paste as-is including it in the post content

• Create a URL card and remove it for Bsky/LinkedIn

This way it will become obvious what’s happening with URLs.