Fix flights map calendar lower bound

src/features/flights-map/calendarRange.test.ts

@@ -40,6 +40,25 @@ describe("getMinDate / getMaxDate", () => {
     const max = getMaxDate();
     expect(max.getTime()).toBe(expected.getTime());
   });
+
+  it("derives date-only bounds from the provided yyyyMMdd anchor", () => {
+    const min = getMinDate("20260506");
+    const max = getMaxDate("20260506");
+
+    expect(min.toISOString()).toBe(new Date(2026, 4, 5).toISOString());
+    expect(max.toISOString()).toBe(new Date(2026, 10, 6).toISOString());
+    expect(min.getHours()).toBe(0);
+    expect(max.getHours()).toBe(0);
+  });
+
+  it("falls back to the runtime clock when the provided anchor is invalid", () => {
+    const min = getMinDate("20269999");
+    const expected = addDays(new Date(), -1);
+
+    expect(min.getFullYear()).toBe(expected.getFullYear());
+    expect(min.getMonth()).toBe(expected.getMonth());
+    expect(min.getDate()).toBe(expected.getDate());
+  });
 });
 
 describe("buildDisabledDates", () => {

src/features/flights-map/calendarRange.ts

@@ -12,19 +12,33 @@
 import { mapWindowBounds } from "@/shared/dateWindow.js";
 
 /** Today with time set to 00:00:00 local. */
-export function today(): Date {
+export function today(baseYyyymmdd?: string): Date {
+  if (baseYyyymmdd) {
+    const parsed = parseYyyymmdd(baseYyyymmdd);
+    if (parsed) return parsed;
+  }
   const d = new Date();
   d.setHours(0, 0, 0, 0);
   return d;
 }
 
 /** minDate = today - 1 day (Angular parity). */
-export function getMinDate(): Date {
+export function getMinDate(baseYyyymmdd?: string): Date {
+  if (baseYyyymmdd) {
+    const d = today(baseYyyymmdd);
+    d.setDate(d.getDate() - 1);
+    return d;
+  }
   return mapWindowBounds()[0];
 }
 
 /** maxDate = today + 6 months (Angular parity). */
-export function getMaxDate(): Date {
+export function getMaxDate(baseYyyymmdd?: string): Date {
+  if (baseYyyymmdd) {
+    const d = today(baseYyyymmdd);
+    d.setMonth(d.getMonth() + 6);
+    return d;
+  }
   return mapWindowBounds()[1];
 }
 
@@ -92,3 +106,20 @@ function toYyyymmdd(d: Date): string {
   const day = d.getDate().toString().padStart(2, "0");
   return `${y}${m}${day}`;
 }
+
+function parseYyyymmdd(value: string): Date | null {
+  if (!/^\d{8}$/.test(value)) return null;
+  const y = Number(value.slice(0, 4));
+  const m = Number(value.slice(4, 6));
+  const d = Number(value.slice(6, 8));
+  const parsed = new Date(y, m - 1, d);
+  parsed.setHours(0, 0, 0, 0);
+  if (
+    parsed.getFullYear() !== y ||
+    parsed.getMonth() !== m - 1 ||
+    parsed.getDate() !== d
+  ) {
+    return null;
+  }
+  return parsed;
+}

src/features/flights-map/components/FlightsMapFilter.test.tsx

@@ -92,6 +92,25 @@ describe("FlightsMapFilter — Calendar wiring", () => {
     expect(max.getTime()).toBe(expectedMax.getTime());
   });
 
+  it("uses the provided SSR today anchor for date-only calendar bounds", () => {
+    const onChange = vi.fn();
+    render(
+      <FlightsMapFilter
+        value={filter()}
+        today="20260506"
+        onChange={onChange}
+      />,
+    );
+
+    const min = lastCalendarProps!["minDate"] as Date;
+    const max = lastCalendarProps!["maxDate"] as Date;
+
+    expect(min.toISOString()).toBe(new Date(2026, 4, 5).toISOString());
+    expect(max.toISOString()).toBe(new Date(2026, 10, 6).toISOString());
+    expect(min.getHours()).toBe(0);
+    expect(min.getMinutes()).toBe(0);
+  });
+
   it("disables every date when availableDays is empty", () => {
     const onChange = vi.fn();
     render(

src/features/flights-map/components/FlightsMapFilter.tsx

@@ -25,6 +25,7 @@ import type { IFlightsMapFilterState } from "../types.js";
 export interface FlightsMapFilterProps {
   value: IFlightsMapFilterState;
   availableDays?: string[];
+  today?: string;
   onChange: (state: IFlightsMapFilterState) => void;
 }
 
@@ -50,6 +51,7 @@ function dateToYyyymmdd(value: Date): string {
 export const FlightsMapFilter: FC<FlightsMapFilterProps> = ({
   value,
   availableDays,
+  today: todayYmd,
   onChange,
 }) => {
   const { t } = useTranslation();
@@ -76,8 +78,8 @@ export const FlightsMapFilter: FC<FlightsMapFilterProps> = ({
     );
   }, [dictionaries, onChange, value]);
 
-  const minDate = useMemo(() => getMinDate(), []);
+  const minDate = useMemo(() => getMinDate(todayYmd), [todayYmd]);
-  const maxDate = useMemo(() => getMaxDate(), []);
+  const maxDate = useMemo(() => getMaxDate(todayYmd), [todayYmd]);
 
   const disabledDates = useMemo(
     () => buildDisabledDates(minDate, maxDate, availableDays ?? []),

src/features/flights-map/components/FlightsMapStartPage.tsx

@@ -393,6 +393,7 @@ export const FlightsMapStartPage: FC<FlightsMapStartPageProps> = ({
           <FlightsMapFilter
             value={filterState}
             availableDays={availableDays}
+            today={todayYmd}
             onChange={handleFilterChange}
           />
         }