fix: exhaustive zero-spread safety audit and render logging

components/WeeklyGrid.tsx

@@ -506,7 +506,7 @@ const WeeklyGrid: React.FC<WeeklyGridProps & { top50Mode: 'eu' | 'uk' }> = ({
             const filtered = prev.filter(f => !(f.week === week && f.metric === metric));
             // Add new filter if provided
             if (filter) {
-                return [...filtered, filter];
+                return filtered.concat([filter]);
             }
             return filtered;
         });