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>

resources/sfx/SOURCES.md

@@ -14,7 +14,7 @@ Cut from the Sound Ideas Series 4000 and Guns libraries and the Universal Studio
 | break | US02-96-1 CRASH, MISCELLANEOUS - SMALL OBJECTS FALLING ON CEMENT | 0.59s | 1x | 11025 | 2808 |
 | cast | synth ember |  | 1x | 11025 | 2556 |
 | charge | synth warp |  | 1x | 11025 | 5076 |
-| chat | synth beeps |  | 1x | 11025 | 567 |
+| chat | synth beeps |  | 1x | 11025 | 576 |
 | crawl | kept from the synth set | | | | |
 | dash | Swish 4003_47_4 | 0.17s | 1x | 11025 | 1143 |
 | death | US03-34-1 KICK, HUMAN - SINGLE KICK INTO STOMACH | 0.17s | 1x | 11025 | 2916 |
@@ -86,6 +86,7 @@ Cut from the Sound Ideas Series 4000 and Guns libraries and the Universal Studio
 | slam | US03-39-2 METAL, HIT - LOUD METAL CLUNK | 0.16s | 0.7x | 11025 | 3852 |
 | slash | Swish 4003_47_2 | 0.79s | 1x | 11025 | 1170 |
 | slash_heavy | Swish 4003_47_2 | 0.79s | 0.75x | 11025 | 1908 |
+| splat | CartoonSplat 4001_32_1 | first | 1x | 11025 | 1116 |
 | step | CartoonFootsteps 4003_46_2 | 0.80s | 1x | 16000 | 891 |
 | swap | kept from the demo1 set | | | | |
 | swing | Swish 4003_47_1 | 0.40s | 1x | 11025 | 1098 |
@@ -102,4 +103,4 @@ Cut from the Sound Ideas Series 4000 and Guns libraries and the Universal Studio
 | wisp | US02-45-5 ARCHERY - SHOOT FLAMING ARROW | 0.18s | 1x | 11025 | 1584 |
 | zap | US03-12-1 ELECTRICITY - SMALL TRANSFORMER ARCS | 0.48s | 1x | 11025 | 1296 |
 
-The built sounds come to 144 KB as BRR.
+The built sounds come to 145 KB as BRR.