feat: refactor utility functions for improved consistency and usability; consolidate parsing logic

app/game-api/src/maps/worldMap.ts

@@ -1,4 +1,5 @@
 import type { GameApiContext, WorldStateRow } from '../context.js';
+import { asRecord, isRecord } from '@sammo-ts/common';
 
 export type MapCityCompact = [number, number, number, number, number, number];
 export type MapNationCompact = [number, string, string, number];
@@ -45,11 +46,6 @@ const MAP_VERSION = 0 as const;
 const BASE_MAP_TTL_SECONDS = 30;
 const PUBLIC_MAP_TTL_SECONDS = 600;
 
-const isRecord = (value: unknown): value is Record<string, unknown> =>
-    value !== null && typeof value === 'object' && !Array.isArray(value);
-
-const asRecord = (value: unknown): Record<string, unknown> => (isRecord(value) ? value : {});
-
 const resolveStartYear = (worldState: WorldStateRow): number => {
     const meta = asRecord(worldState.meta);
     const scenarioMeta = asRecord(meta.scenarioMeta);