FlightsMapFilter: auto-fill date to today when departure picked (Angular parity)

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

@@ -85,8 +85,14 @@ export const FlightsMapFilter: FC<FlightsMapFilterProps> = ({
   );
 
   useEffect(() => {
-    if (!value.date) return;
-    const current = yyyymmddToDate(value.date);
+    // Mirrors Angular FlightsMapFiltersStateService.snapToNearestAvailable.
+    // With a date set, re-anchor it forward if it lands on a disabled day.
+    // With no date but a departure set, auto-fill to today (or next enabled
+    // day) — Angular runs snap from setDisabledDates after the calendar API
+    // responds, which seeds the input on first route selection.
+    if (!value.date && !value.departure) return;
+
+    const current = value.date ? yyyymmddToDate(value.date) : new Date();
     if (!current) return;
 
     const snapped = findNextEnabledDate(current, disabledDates, minDate, maxDate);