feat(web): add combat_deaths to MatchResult and display in sandbox

- Add combat_deaths field to MatchResult interface (types.ts, engine.ts)
- Display combat kills count in sandbox match result panel
- Combat deaths were already tracked in engine (CombatDeaths []int)
  but not exposed in the web UI types or displayed to users

Closes: bf-2wjo

web/src/engine.ts

@@ -55,6 +55,7 @@ export interface MatchResult {
   scores: number[];
   energy: number[];
   bots_alive: number[];
+  combat_deaths?: number[];
 }
 
 export interface GameState {

web/src/pages/sandbox.ts

@@ -870,9 +870,10 @@ function loadMonaco(): Promise<any> {
 function formatResult(result: any, replay: any, _numPlayers: number): string {
   const winnerName = result.winner >= 0 ? replay.players[result.winner].name : 'Draw';
   const winnerClass = result.winner === 0 ? 'win' : result.winner >= 0 ? 'loss' : 'draw';
-  const scoreRows = replay.players.map((p: any, i: number) =>
-    `<div class="result-player"><span class="player-dot" style="background:${PLAYER_COLORS[i % PLAYER_COLORS.length]}"></span>${p.name}: ${result.scores[i]} pts, ${result.bots_alive[i]} bots alive</div>`
-  ).join('');
+  const scoreRows = replay.players.map((p: any, i: number) => {
+    const combatDeaths = result.combat_deaths?.[i] ?? 0;
+    return `<div class="result-player"><span class="player-dot" style="background:${PLAYER_COLORS[i % PLAYER_COLORS.length]}"></span>${p.name}: ${result.scores[i]} pts, ${result.bots_alive[i]} bots alive, ${combatDeaths} combat kills</div>`;
+  }).join('');
   return `
     <div class="result-banner ${winnerClass}">
       <strong>${result.winner >= 0 ? winnerName + ' wins!' : 'Draw'}</strong>

web/src/types.ts

@@ -25,6 +25,7 @@ export interface MatchResult {
   scores: number[];
   energy: number[];
   bots_alive: number[];
+  combat_deaths?: number[];
 }
 
 export interface ReplayPlayer {