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>

src/fighter.cpp

@@ -154,8 +154,12 @@ void Fighter::damage_take(Sim& sim, Damage damage)
 
 void Fighter::update(Sim& sim)
 {
+    // Out of the round, it still keeps track of its buttons, so a held one (like Ready on the results) counts once.
     if (!isAlive)
+    {
+        buttonsPrevious = controls.buttons;
         return;
+    }
     cornerPrevious = {body.box.x, body.box.y};
     flash = std::max(0.0f, flash - FLASH_DECAY * TICK);
     shockCooldown -= TICK;