• Friends hear the game. A friend's sound in Play Together (and on the watch page) never
  played right: the player fed each sound frame's 2-byte number to the decoder as if it were
  sound, so browsers either stopped with a decode error or played noise. Fixed, and checked
  against a PS5 for a minute at a time in Chrome and Safari's engine with no gaps. Also:
  • Safari's way of naming the sound's format is now asked first, so iPhones no longer say
    "No sound in this browser" when they can play it (For #657).
  • Sound never doubles up, keeps its delay short, comes back after a decode hiccup, and
    starts again after a phone call or switching tabs.
  • The host's engine sends friends' sound ahead of their picture, so a busy connection
    delays the picture rather than dropping the sound.
  • Friends get a Mute button, remembered for the next game.
• Host stops, friends know at once. When the host stops Play (Stop, the banner or the
  mini player), Play Together ends with it and friends see that straight away, instead of a
  60-second wait for a host who isn't coming back. If the host's stream drops by itself,
  friends still wait for it to come back, and the waiting screen now has Leave.
• Full screen on phones: buttons only when you want them. On a phone or tablet the
  buttons over a friend's game start hidden and no longer pop up on every tap. Press and
  hold the picture (away from the controller) to show them; hold again or tap Hide to
  put them away. A hint says so the first time.