Multiple improvements to link cards and quote posts (#2398)

* fix canvas

* fix external link embed styles

* Use the same link-card style on web and mobile and give a little more height on desktop to the card images

* Use dark border on link embeds to match quote post style

* Fix the highlighting behavior on linkcards and quoteposts

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Co-authored-by: Hailey <me@haileyok.com>

src/view/com/util/post-embeds/QuoteEmbed.tsx

@@ -98,6 +98,7 @@ export function QuoteEmbed({
   return (
     <Link
       style={[styles.container, pal.borderDark, style]}
+      hoverStyle={{borderColor: pal.colors.borderLinkHover}}
       href={itemHref}
       title={itemTitle}>
       <PostMeta