Change black empty tile to grass and make it destructable

src/core/terrain.ts

@@ -0,0 +1,49 @@
+export const TileType = {
+  EMPTY: 1,
+  WALL: 4,
+  GRASS: 15,
+  EMPTY_DECO: 24,
+  WALL_DECO: 12,
+  EXIT: 8,
+  WATER: 63 // Unused but kept for safety/legacy
+} as const;
+
+export type TileType = typeof TileType[keyof typeof TileType];
+
+export interface TileBehavior {
+  id: TileType;
+  isBlocking: boolean;
+  isDestructible: boolean;
+  isDestructibleByWalk?: boolean;
+  destructsTo?: TileType;
+}
+
+export const TILE_DEFINITIONS: Record<number, TileBehavior> = {
+  [TileType.EMPTY]: { id: TileType.EMPTY, isBlocking: false, isDestructible: false },
+  [TileType.WALL]: { id: TileType.WALL, isBlocking: true, isDestructible: false },
+  [TileType.GRASS]: { id: TileType.GRASS, isBlocking: false, isDestructible: true, isDestructibleByWalk: true, destructsTo: TileType.EMPTY },
+  [TileType.EMPTY_DECO]: { id: TileType.EMPTY_DECO, isBlocking: false, isDestructible: false },
+  [TileType.WALL_DECO]: { id: TileType.WALL_DECO, isBlocking: true, isDestructible: false },
+  [TileType.EXIT]: { id: TileType.EXIT, isBlocking: false, isDestructible: false },
+  [TileType.WATER]: { id: TileType.WATER, isBlocking: true, isDestructible: false }
+};
+
+export function isBlocking(tile: number): boolean {
+  const def = TILE_DEFINITIONS[tile];
+  return def ? def.isBlocking : false;
+}
+
+export function isDestructible(tile: number): boolean {
+  const def = TILE_DEFINITIONS[tile];
+  return def ? def.isDestructible : false;
+}
+
+export function isDestructibleByWalk(tile: number): boolean {
+  const def = TILE_DEFINITIONS[tile];
+  return def ? !!def.isDestructibleByWalk : false;
+}
+
+export function getDestructionResult(tile: number): number | undefined {
+  const def = TILE_DEFINITIONS[tile];
+  return def ? def.destructsTo : undefined;
+}