Clamp projectScheduleToBoard.date to today only when schedule dateFrom is out-of-window

src/shared/state/crossSectionNavigation.test.ts

@@ -186,10 +186,11 @@ describe("4.1.8-R1/R2: projectBoardToSchedule", () => {
 });
 
 describe("4.1.8-R1/R2: projectScheduleToBoard", () => {
-  it("carries departure + arrival, sets date=today, clears time", () => {
+  it("carries departure + arrival, preserves in-window dateFrom, clears time", () => {
+    // Clock frozen at 2026-05-15. dateFrom = 2026-05-14 (yesterday, within Board window [-1,+14])
     const sched: ScheduleFilterSnapshot = {
       mode: "route", departure: "MOW", arrival: "LED",
-      dateFrom: "20260511", dateTo: "20260517",
+      dateFrom: "20260514", dateTo: "20260520",
       timeFrom: "0600", timeTo: "2200",
       onlyDirect: true, showReturn: false,
       searchExecuted: true,
@@ -197,12 +198,38 @@ describe("4.1.8-R1/R2: projectScheduleToBoard", () => {
     const p = projectScheduleToBoard(sched);
     expect(p.departure).toBe("MOW");
     expect(p.arrival).toBe("LED");
-    expect(p.date).toBe("20260515"); // today (frozen clock)
+    expect(p.date).toBe("20260514"); // in-window → preserved
     expect(p.timeFrom).toBe("0000");
     expect(p.timeTo).toBe("2400");
     expect(p.searchExecuted).toBe(false);
   });
 
+  it("4.1.8-R2: preserves dateFrom when schedule dateFrom is today (in-window)", () => {
+    // Clock frozen at 2026-05-15. dateFrom = today is definitely in window.
+    const sched: ScheduleFilterSnapshot = {
+      mode: "route", departure: "MOW", arrival: "LED",
+      dateFrom: "20260515", dateTo: "20260521",
+      timeFrom: "0000", timeTo: "2400",
+      onlyDirect: false, showReturn: false,
+      searchExecuted: true,
+    };
+    const p = projectScheduleToBoard(sched);
+    expect(p.date).toBe("20260515"); // in-window → preserved (also equals today)
+  });
+
+  it("4.1.8-R2: preserves dateFrom when schedule dateFrom is within +14 days", () => {
+    // Clock frozen at 2026-05-15. +7 days = 2026-05-22, within the +14 window.
+    const sched: ScheduleFilterSnapshot = {
+      mode: "route", departure: "MOW", arrival: "LED",
+      dateFrom: "20260522", dateTo: "20260528",
+      timeFrom: "0000", timeTo: "2400",
+      onlyDirect: false, showReturn: false,
+      searchExecuted: true,
+    };
+    const p = projectScheduleToBoard(sched);
+    expect(p.date).toBe("20260522"); // in-window → preserved
+  });
+
   it("does not carry optional departure when schedule has only arrival", () => {
     const p = projectScheduleToBoard({
       mode: "route", arrival: "LED",
@@ -226,7 +253,7 @@ describe("4.1.8-R1/R2: projectScheduleToBoard", () => {
     expect(p.mode).toBe("route");
   });
 
-  it("4.1.8-R2: projectScheduleToBoard clamps to today when schedule dateFrom is > board window", () => {
+  it("4.1.8-R2: projectScheduleToBoard clamps to today when schedule dateFrom is outside board window (future)", () => {
     // Clock frozen at 2026-05-15. Schedule dateFrom = 2026-07-01 (47 days forward, outside board's +14 window)
     const schedule: ScheduleFilterSnapshot = {
       mode: "route",
@@ -244,8 +271,8 @@ describe("4.1.8-R1/R2: projectScheduleToBoard", () => {
     expect(projected.date).toBe("20260515"); // clamps to today
   });
 
-  it("4.1.8-R2: projectScheduleToBoard uses today even when schedule dateFrom is before today-1", () => {
-    // Schedule dateFrom in the distant past
+  it("4.1.8-R2: projectScheduleToBoard clamps to today when schedule dateFrom is outside board window (past)", () => {
+    // Schedule dateFrom in the distant past, outside the -1 day board window
     const schedule: ScheduleFilterSnapshot = {
       mode: "route",
       departure: "MOW",

src/shared/state/crossSectionNavigation.ts

@@ -6,6 +6,8 @@
  * projected from / to Board or Schedule (per TZ §4.1.1 ¶12).
  */
 
+import { isInBoardWindow } from "@/shared/dateWindow.js";
+
 export interface BoardFilterSnapshot {
   mode: "route" | "flight-number" | "departure" | "arrival";
   departure?: string;
@@ -97,13 +99,20 @@ export function projectBoardToSchedule(b: BoardFilterSnapshot): ScheduleFilterSn
   };
 }
 
-/** TZ Table 10: Schedule → Board projection. Preserves cities + date=today. */
+/**
+ * TZ Table 10: Schedule → Board projection. Preserves cities.
+ * Date: use schedule's dateFrom if it falls within the Board window
+ * ([-1, +14] days from today); otherwise clamp to today. This preserves
+ * user intent when the schedule date is near-term but avoids showing a
+ * date the Board cannot display.
+ */
 export function projectScheduleToBoard(s: ScheduleFilterSnapshot): BoardFilterSnapshot {
+  const date = isInBoardWindow(s.dateFrom) ? s.dateFrom : todayYyyymmdd();
   return {
     mode: "route",
     ...(s.departure ? { departure: s.departure } : {}),
     ...(s.arrival ? { arrival: s.arrival } : {}),
-    date: todayYyyymmdd(),
+    date,
     timeFrom: "0000",
     timeTo: "2400",
     searchExecuted: false,