GhiVideo 소스 복제 — v4 작업 시작 기준

기존 GhiVideo 저장소 HEAD의 트래킹 소스 362개 파일을 복제.
(node_modules·storage·빌드 산출물·대용량 미디어는 .gitignore 규칙대로 제외)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/src/stationbar/utils/mileage.ts

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+import { ROUTE_LEGS } from '../mocks/route';
+import type { RouteLeg } from '../types/timeline';
+
+const MILEAGE_ROUND_M = 10;
+const METERS_PER_KM = 1000;
+
+/** Mileage in meters at a cursor px, via piecewise-linear leg anchors. */
+export function mileageAtPx(px: number, legs: RouteLeg[] = ROUTE_LEGS): number {
+  const leg =
+    legs.find((l) => px >= l.startPx && px <= l.endPx) ?? legs[legs.length - 1];
+  const anchors = leg.anchors;
+  for (let i = 0; i < anchors.length - 1; i++) {
+    const a = anchors[i];
+    const b = anchors[i + 1];
+    if (px <= b.px || i === anchors.length - 2) {
+      const t = Math.min(1, Math.max(0, (px - a.px) / (b.px - a.px)));
+      return a.mileage + (b.mileage - a.mileage) * t;
+    }
+  }
+  return anchors[0].mileage;
+}
+
+/**
+ * First px at which the given mileage occurs. Leg start anchors win so a jump
+ * to a turn mileage lands on the start of that leg.
+ */
+export function pxForMileage(
+  mileage: number,
+  legs: RouteLeg[] = ROUTE_LEGS,
+): number | null {
+  for (const leg of legs) {
+    if (leg.anchors[0].mileage === mileage) return leg.startPx;
+  }
+  for (const leg of legs) {
+    const anchors = leg.anchors;
+    for (let i = 0; i < anchors.length - 1; i++) {
+      const a = anchors[i];
+      const b = anchors[i + 1];
+      const lo = Math.min(a.mileage, b.mileage);
+      const hi = Math.max(a.mileage, b.mileage);
+      if (mileage >= lo && mileage <= hi) {
+        return a.px + (b.px - a.px) * ((mileage - a.mileage) / (b.mileage - a.mileage));
+      }
+    }
+  }
+  return null;
+}
+
+/** 158204 → "158k200". */
+export function formatMileage(mileage: number): string {
+  const rounded = Math.round(mileage / MILEAGE_ROUND_M) * MILEAGE_ROUND_M;
+  const km = Math.floor(rounded / METERS_PER_KM);
+  const m = rounded % METERS_PER_KM;
+  return `${km}k${String(m).padStart(3, '0')}`;
+}
+
+/** Accepts "158k200", "158200", "161800"… Returns meters or null. */
+export function parseMileageQuery(raw: string): number | null {
+  const digits = raw.toLowerCase().replace(/k/g, '').replace(/[^0-9]/g, '');
+  const mileage = parseInt(digits, 10);
+  return Number.isFinite(mileage) && mileage > 0 ? mileage : null;
+}