fix(deep-dive): reset scroll position when opening a new country (#2883)

The panel reuses the same DOM element, so scroll position persisted
across countries. Opening a second country after scrolling to the
bottom of the first would start at the bottom.

src/components/CountryDeepDivePanel.ts

@@ -193,6 +193,7 @@ export class CountryDeepDivePanel implements CountryBriefPanel {
     this.economicIndicators = [];
     this.infrastructureByType.clear();
     this.renderSkeleton(country, code, score, signals);
+    this.content.scrollTop = 0;
     this.open();
   }