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/api/test/helpers.ts

@@ -17,7 +17,7 @@ function assertTestTargets() {
 
 export async function resetState() {
   assertTestTargets();
-  await sql`truncate users, tracks, track_links, sessions, follows, connections, now_playing, featured_songs, listens, devices, blocks, reports, avatars, password_resets, email_verifications restart identity cascade`;
+  await sql`truncate users, tracks, track_links, sessions, follows, connections, now_playing, featured_songs, listens, devices, blocks, reports, avatars, password_resets, email_verifications, reactions restart identity cascade`;
   await redis.flushdb();
 }