fix(embeds): wider card for Tidal, declutter caption while video plays

- Widen the interactive-embed card to min(38rem, 94vw) so the Tidal player (and
  other audio/video embeds) has enough width.
- Hide the title/description caption while a video embed is playing, so the text
  below it stops squeezing the player small (Twitch).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/components/url-preview/UrlPreview.css.tsx

@@ -18,7 +18,7 @@ export const UrlPreview = style([
 // so the player chrome / tweet content isn't cramped or clipped. Defined after
 // UrlPreview so its width wins the cascade.
 export const UrlPreviewWide = style({
-  width: 'min(34rem, 92vw)',
+  width: 'min(38rem, 94vw)',
 });
 
 export const UrlPreviewImg = style([