games: burial send-offs, money rain on wins, and honest stack targeting

Three front-end changes to the casino games:

- uno: a draw-card stack now names the seat it's actually pointed at
  ("+N on Beep") instead of always reading "+N on you". The bill reads
  v.turn, which the engine advances to the target when a draw card lands.

- uno: the No Mercy rule buries a seat with some ceremony now. bury()
  rolls one of four send-offs over the seat (or your hand, if it's you) —
  a rockslide that piles up, a tombstone, a coffin, or the Mega Man death
  burst — each with its own synth sound, and a static headstone under
  reduced motion. The "Buried on N" badge still rides alongside.

- all games: winning makes it rain. FX.moneyRain drops a curtain of bills
  and coins with a jackpot coin-cascade sound, gated by significance so it
  reads as a win and not as noise: hold'em keeps its light per-pot confetti
  and only rains on a real haul (>= 20bb), while the confetti stays the
  rare cherry (natural 21, full board clear, phrase solved outright).

internal/web/static/css/input.css

@@ -940,6 +940,18 @@ html[data-phase="night"] {
     will-change: transform, opacity;
   }
 
+  /* Falling money — the win curtain. Positioned entirely by the transform WAAPI
+     drives (see moneyRain in casino-fx.js), so it starts pinned to the top-left. */
+  .pete-money {
+    position: absolute;
+    top: 0;
+    left: 0;
+    font-size: 1.6rem;
+    line-height: 1;
+    filter: drop-shadow(0 2px 2px rgba(0,0,0,0.35));
+    will-change: transform, opacity;
+  }
+
   /* The dealer's beat before they draw out. */
   .pete-dealer-think {
     animation: pete-think 0.9s ease-in-out infinite;
@@ -1978,6 +1990,93 @@ html[data-phase="night"] {
   }
   .pete-uno-seat[data-out="1"] .pete-uno-count { color: #ffb3ba; }
 
+  /* The send-off. When the mercy rule buries a seat, uno.js rolls one of four
+     of these and drops it over that seat — or over your hand, if it's you going
+     down. Every piece is built fresh and clears itself, so it can't outlive the
+     hand. The wrap is a zero-size anchor at the seat's middle; the pieces hang
+     off it. */
+  .pete-uno-bury {
+    position: absolute;
+    left: 50%;
+    top: 45%;
+    width: 0;
+    height: 0;
+    z-index: 40;
+    pointer-events: none;
+  }
+
+  /* Rockslide: a handful of boulders come down and pile where the seat was. */
+  .pete-uno-rock {
+    position: absolute;
+    left: 0;
+    top: 0;
+    font-size: 1.5rem;
+    line-height: 1;
+    filter: drop-shadow(0 2px 1px rgba(0,0,0,0.4));
+    animation: pete-bury-rock 0.6s cubic-bezier(0.5, 0, 0.7, 1) both;
+    animation-delay: var(--d, 0ms);
+  }
+  @keyframes pete-bury-rock {
+    0%   { transform: translate(calc(-50% + var(--dx)), -3.4rem) rotate(0deg); opacity: 0; }
+    20%  { opacity: 1; }
+    75%  { transform: translate(calc(-50% + var(--dx)), var(--dy)) rotate(var(--rot)); }
+    85%  { transform: translate(calc(-50% + var(--dx)), calc(var(--dy) - 0.22rem)) rotate(var(--rot)); }
+    100% { transform: translate(calc(-50% + var(--dx)), var(--dy)) rotate(var(--rot)); opacity: 1; }
+  }
+
+  /* Tombstone and coffin: one heavy thing drops in and sets, with a small bounce. */
+  .pete-uno-tomb,
+  .pete-uno-coffin {
+    position: absolute;
+    left: 0;
+    top: 0;
+    line-height: 1;
+    filter: drop-shadow(0 3px 2px rgba(0,0,0,0.45));
+    animation: pete-bury-drop 0.5s cubic-bezier(0.34, 1.3, 0.64, 1) both;
+  }
+  .pete-uno-tomb { font-size: 2.4rem; }
+  .pete-uno-coffin { font-size: 2.5rem; }
+  @keyframes pete-bury-drop {
+    0%   { transform: translate(-50%, -3.2rem) scale(0.7); opacity: 0; }
+    55%  { opacity: 1; }
+    70%  { transform: translate(-50%, -50%) scale(1.06); }
+    82%  { transform: translate(-50%, -44%) scale(1); }
+    100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
+  }
+
+  /* The Mega Man death: a flash, then eight pieces fire out and wink off. */
+  .pete-uno-zap-flash {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 1.5rem;
+    height: 1.5rem;
+    margin: -0.75rem 0 0 -0.75rem;
+    border-radius: 999px;
+    background: radial-gradient(circle, #fff 0%, rgba(180,220,255,0) 70%);
+    animation: pete-bury-flash 0.35s ease-out both;
+  }
+  @keyframes pete-bury-flash {
+    0%   { transform: scale(0.3); opacity: 0.95; }
+    100% { transform: scale(1.9); opacity: 0; }
+  }
+  .pete-uno-zap-bit {
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 0.5rem;
+    height: 0.5rem;
+    margin: -0.25rem 0 0 -0.25rem;
+    border-radius: 999px;
+    background: #cfeaff;
+    box-shadow: 0 0 6px 1px rgba(150,210,255,0.9);
+    animation: pete-bury-zap 0.5s ease-out both;
+  }
+  @keyframes pete-bury-zap {
+    0%   { transform: rotate(var(--ang)) translateX(0.2rem); opacity: 1; }
+    100% { transform: rotate(var(--ang)) translateX(3.4rem); opacity: 0; }
+  }
+
   /* The rules switch: two dials, and this is the one that isn't the table size. */
   .pete-seg {
     display: inline-flex;
@@ -2043,6 +2142,9 @@ html[data-phase="night"] {
     .pete-uno-card[data-glow="1"]::before { animation: none; }
     .pete-uno-card[data-glow="1"] .pete-uno-face::after { display: none; }
     .pete-uno-pending { animation: none; }
+    /* The grave still gets marked — that's information — it just doesn't fall in.
+       uno.js drops a single static headstone here rather than the full rockslide. */
+    .pete-uno-tomb { animation: none; transform: translate(-50%, -50%); }
   }
 }