play/pause button

server/index.js

@@ -136,6 +136,14 @@ const handlers = {
     commit();
   },
 
+  // Broadcast without saving: `paused` is not part of the persisted state.
+  setPaused(_ws, msg) {
+    if (typeof msg.paused !== 'boolean') return;
+    if (store.getState().paused === msg.paused) return;
+    store.getState().paused = msg.paused;
+    broadcastState();
+  },
+
   setBackground(_ws, msg) {
     if (!store.isBackground(msg.key)) return;
     store.getState().background = msg.key;

server/state.js

@@ -23,6 +23,9 @@ const state = {
   currentId: null,
   background: DEFAULT_BACKGROUND,
   animation: DEFAULT_ANIMATION,
+  // Deliberately absent from save(): a restart should bring the music back,
+  // not leave the party silently paused because of a click hours ago.
+  paused: false,
 };
 
 export function getState() {