Address code review: make WKWebView a private ivar, fix direct scrollView access

Co-authored-by: ppaulojr <1206478+ppaulojr@users.noreply.github.com>

Author: Copilot

PopulationClock/CountryInfoWebView.h

@@ -10,7 +10,6 @@
 
 @interface CountryInfoWebView : UIView
 
-@property (nonatomic, readonly) WKWebView *webView;
 @property (nonatomic, readonly) UIScrollView *scrollView;
 
 - (void)loadHTMLString:(NSString *)string baseURL:(NSURL *)baseURL;

PopulationClock/CountryInfoWebView.m

@@ -14,6 +14,7 @@
 #import "StatsBuilder.h"
 
 @implementation CountryInfoWebView {
+    WKWebView *_webView;
     NSString *_selectedCountry;
     CALayer *_shadowLayer;
 
@@ -46,7 +47,7 @@ - (void)awakeFromNib {
     dispatch_set_target_queue(_backgroundQueue, lowPriorityQueue);
 
     // Disable bouncing
-    self.scrollView.bounces = NO;
+    _webView.scrollView.bounces = NO;
 
     // Observe changes to the country selection
     [[NSNotificationCenter defaultCenter] addObserver:self