Emoji reactions on songs

React to a friend's current song or any of their recent plays: tap an
emoji to add yours (or take it back), "☺+" for the quick six, and a full
picker with search and categories (Unicode emoji up to 13.1, generated
into the shared package so web and mobile match). One reaction per person
per play; a new one replaces the old. Chips show counts and, on hover/
long label, who reacted; yours is highlighted. Listeners and followers get
the update live. Not on your own plays, not across a block (blocking also
clears reactions between the two people).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8

apps/mobile/src/components/NowPlayingCard.tsx

@@ -18,6 +18,7 @@ import { colors, radius, space } from '@/lib/theme';
 import { Avatar } from './Avatar';
 import { Equalizer } from './Equalizer';
 import { ProgressBar } from './ProgressBar';
+import { Reactions } from './Reactions';
 import { TrackCard } from './TrackCard';
 
 export function NowPlayingCard({
@@ -95,6 +96,7 @@ export function NowPlayingCard({
         <TrackCard track={np.track} preferred={preferred} />
       </Animated.View>
       <ProgressBar np={np} />
+      <Reactions listenId={np.listenId} reactions={np.reactions} ownerId={np.user.id} />
     </View>
   );
 }