Tomatoes, match tabs, shared pings, and a round of fixes

- On the results, everyone but the winner splats tomatoes where they
  click (bots aim at the winner), with a new splat sound.
- During a match the menu has the item tabs (choosing when the
  countdown allows, and otherwise levelling the sandbox's levels for
  when you're back), Play (the game's rules) and Settings.
- Pings are shared through the server (protocol 4), so other players'
  connection bars show over their heads and on their windows.
- PvP comes into lobbies with your profile and is saved.
- The choice menu opens by itself however the countdown began.
- Knocked-out fighters keep their buttons current, so Ready on the
  results toggles once per press.
- The weapon wheel wraps both ways. Readying with empty slots plays
  the equip sound for your own fighter.
- Shock Absorber: up to 50% less weapon movement and 33% less
  knockback. Only the catalog previews the next level.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/server.cpp

@@ -495,6 +495,12 @@ static void packet_handle(int id, const std::string& bytes)
         if (reader.get(isTyping))
             lobby_send(member.code, PacketWriter().put(PACKET_TYPING).put(id).put(isTyping).bytes, true);
     }
+    if (type == PACKET_PING)
+    {
+        Uint16 ping = 0;
+        if (reader.get(ping))
+            lobby_send(member.code, PacketWriter().put(PACKET_PING).put(id).put(ping).bytes, true);
+    }
 }
 
 // The controls a room's fighter plays this tick: its member's for the tick if they came, or their last again (without