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

packages/shared/src/client.ts

@@ -3,6 +3,7 @@ import type {
   AdminStatsDTO,
   ConnectionDTO,
   FollowListDTO,
+  ReactionDTO,
   FeedItemDTO,
   MeDTO,
   ProfileDTO,
@@ -126,6 +127,10 @@ export function createApiClient({ baseUrl, getToken, credentials }: ApiClientOpt
     suspend: (username: string) => request(`/admin/users/${q(username)}/suspend`, { method: 'POST', body: {} }),
     unsuspend: (username: string) => request(`/admin/users/${q(username)}/suspend`, { method: 'DELETE' }),
 
+    /** React to a play with one emoji (replaces your earlier one). Returns that play's reactions. */
+    react: (listenId: string, emoji: string) => request<ReactionDTO[]>(`/listens/${q(listenId)}/reaction`, { method: 'PUT', body: { emoji } }),
+    unreact: (listenId: string) => request<ReactionDTO[]>(`/listens/${q(listenId)}/reaction`, { method: 'DELETE' }),
+
     searchTracks: (query: string) => request<TrackSearchResultDTO[]>(`/tracks/search?q=${q(query)}`),
 
     connections: () => request<ConnectionDTO[]>('/connections'),