Add 3D dice roll animation for thrown rocks

Emit the individual rock-die faces (0/0/1/1/2/2) from the battle
resolver so the client can render a real CSS 3D cube per die that
tumbles and settles on the rolled face, replacing the flat random
damage number. Falls back to the flying-rock cue for older battle logs
without per-die data.

web/src/types.ts

@@ -59,6 +59,7 @@ export interface BattleEvent {
   died?: boolean[]
   // rock / strip / steal
   roll?: number
+  dice?: number[] // rock: individual die faces (each 0, 1, or 2)
   damageAfter?: number
   targetDied?: boolean
   // eat (new bonus total) / reveal (starting bonus)