Store cumulative player scores alongside balances

src/lib/match-history.ts

@@ -42,6 +42,8 @@ export interface MatchPlayer {
     downs: number | null;
     revives: number | null;
     bestScore: number | null;
+    /** Highest reported cumulative match score; null when the reporter omitted it. */
+    scoreTotal: number | null;
 }
 
 export interface MatchDetail extends ServerMatch {