defVideo 작업분 반영

client/src/stationbar/constants/routeSegmentAssets.ts

@@ -0,0 +1,18 @@
+import type { RouteProgressState } from '../types/timeline';
+import { asset } from '../utils/asset';
+
+const STRUCTURE_STATES: RouteProgressState[] = ['upcoming', 'passed', 'revisit'];
+
+// 교량/터널 3분할 이미지는 RouteSegment.module.scss 에서 직접 url() 로 쓴다.
+
+export function terminalCircleAsset(
+  state: Extract<RouteProgressState, 'upcoming' | 'passed' | 'revisit'>,
+): string {
+  return asset(`/assets/route-segment/terminal/circle-${state}.png`);
+}
+
+export function isStructureAssetState(
+  state: RouteProgressState,
+): state is Extract<RouteProgressState, 'upcoming' | 'passed' | 'revisit'> {
+  return STRUCTURE_STATES.includes(state);
+}