Handle long feed listings on the right nav with scrolling (#1562)

src/view/shell/desktop/Feeds.tsx

@@ -82,11 +82,12 @@ function FeedItem({
 
 const styles = StyleSheet.create({
   container: {
-    position: 'relative',
+    flex: 1,
+    overflowY: 'auto',
     width: 300,
     paddingHorizontal: 12,
+    paddingVertical: 18,
     borderTopWidth: 1,
     borderBottomWidth: 1,
-    paddingVertical: 18,
   },
 })

src/view/shell/desktop/RightNav.tsx

@@ -125,6 +125,8 @@ const styles = StyleSheet.create({
     // @ts-ignore web only
     left: 'calc(50vw + 320px)',
     width: 304,
+    // @ts-ignore web only
+    maxHeight: '90vh',
   },
 
   message: {