Fix Vercel build error: Restore broken interface definition in ForecastView.tsx

components/ForecastView.tsx

@@ -12,6 +12,11 @@ import {
     LineChart, Line, Legend, ComposedChart, Area
 } from 'recharts';
 
+interface ForecastViewProps {
+    data: ProductForecastData[];
+    filters: FilterState;
+    onFilterChange: (newFilters: FilterState) => void;
+    stockMap: Map<string, number>;
     top50Mode: 'eu' | 'uk';
     vendorStockMap?: Map<string, { eu: number; uk: number }>;
     vendorStockFilter: string[];