feat(embeds): add Bluesky, Loom, Kick

From the coverage-review agent's ranked recommendations (clean iframes, ids in
the URL, one CSP host each):
- Bluesky: bsky.app/profile/{authority}/post/{rkey} → embed.bsky.app (rich, self-
  resizing like the other post embeds).
- Loom: loom.com/share|embed/{id} → www.loom.com/embed/{id} (16:9).
- Kick: kick.com/{channel} → player.kick.com/{channel} (live channels only; VODs/
  clips have no clean embed and fall back to a link).

Parsers unit-tested. CSP frame-src gains embed.bsky.app / www.loom.com /
player.kick.com (desktop + live web, both updated). Needs live verification once
deployed since the embeds themselves can't be exercised from here.

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

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

@@ -457,6 +457,21 @@ export const BadgeInstagram = style({
   color: '#ffffff',
 });
 
+export const BadgeBluesky = style({
+  backgroundColor: '#0085ff',
+  color: '#ffffff',
+});
+
+export const BadgeLoom = style({
+  backgroundColor: '#625df5',
+  color: '#ffffff',
+});
+
+export const BadgeKick = style({
+  backgroundColor: '#53fc18',
+  color: '#000000',
+});
+
 export const BadgeTidal = style({
   backgroundColor: '#000000',
   color: '#ffffff',