Splatter: clear the wave by hand, tougher 2-hit shamblers, set cards, free depth

Feedback batch from a phone playtest:

- Winning a game no longer auto-sweeps the court. The survivors stay and must
  be killed by hand (no new spawns, no scoring during the mop-up); only once the
  court is clear does play advance to the changeover / next game / set. Replaces
  sweepCourt() with a G.clearing gate + proceedAfterClear(). "CLEAR THE COURT".
- Classic shamblers (a/b) now soak one splat-quality wound before they drop
  (shamblerHp=2) — swapping to new z_aw/z_bw wound skins that bleed the thin
  dynamic trickle plus a small impact pop. Only the runner stays one-shot glass;
  brute/boss unchanged. Ball, pellets and triple side-balls all respect hp.
- Winning a SET shows a centered milestone card (a real pause) before the horde;
  one reusable drawCard() now backs both it and the reworded sudden-death card.
- Player is no longer pinned to the baseline: free to advance up-court on
  keyboard (bounded at the net); touch keeps the baseline (drag is the serve-aim)
  and the horde/GUN burst re-brace there.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

state.js

@@ -52,6 +52,11 @@ export const G = {
   runGames: 0,        // games finished this run (either side) — the difficulty director
   sets: [0, 0],       // splatter sets won [you, them]; 6 games = a set = a horde
   changeover: false,  // the odd-game breather: no spawns, no serving, the boys mop
+  clearing: false,    // a game just ended: the surviving wave stays and must be killed by HAND before play advances (no auto-sweep). No new spawns, kills don't score.
+  afterClear: null,   // what happens once the court is clear: 'changeover' | 'game' | 'set'
+  clearWinner: null,  // 'P'|'O' — who took the game/set being cleared (for the milestone card)
+  pendingHorde: false,// a set was won; the horde starts after the set card's pause
+  card: null,         // {title, sub1, sub2, color, t} — centered milestone card (set won, duel); the reusable 'block'
   shameGame: false,   // they took a game — the next new-balls delivery is withheld
   best: null,         // best run {games, sets}, loaded from localStorage when you get eaten
   newBest: false,     // this run beat the stored best — the eaten summary celebrates it