URL rendering and previews

Feature request: choose how a pasted link is displayed Summary When a URL is pasted or inserted into a document, let the user choose how it is displayed, as Notion, Confluence and Google Docs do: 1. URL: the raw link (current behavior) 2. Inline mention: favicon + page title, rendered as a compact chip within the text 3. Preview card: a block with title, description, favicon and source domain (Screenshot below: the same Wikipedia link shown in all three modes.) Proposed behavior • On paste, show a small popover (or use the existing link toolbar) with the three display options • Default to the inline mention, so readable titles replace raw URLs automatically • Allow switching between modes afterwards from the link toolbar • Fetch title, favicon and description from the page's Open Graph / HTML metadata, with a fallback to the plain URL if nothing can be retrieved Motivation • Readability and accessibility: long raw URLs are hard…