Let players peek both decks during and after a battle

Record each seat's arranged lineup on the battle result (already public)
and reveal the full deck in a popover when hovering a deck pile in the
battle view — the opponent's included.

web/src/types.ts

@@ -69,6 +69,7 @@ export interface BattleEvent {
 export interface BattleResult {
   round: number
   stackSizes: number[]
+  lineups?: Card[][] // each seat's arranged deck (top first); public for peeking
   events: BattleEvent[] | null
   winnerSeat: number
   trophies: number