Keep RNTester content clear of the iOS tab bar

#58900 capped the bottom content inset at 65pt for bottom tab bars, but
the tab bar is 83pt tall on current iPhones. The bottom 18pt of every
RNTester screen sat under the tab bar, so taps there switched tabs.
flatlist-append-maintainvisible taps "Reset" at y=874 and landed on the
Playground tab.

Use the full bottom safe-area inset instead.

Author: cipolleschi

packages/rn-tester/RNTesterTabsIOS/ios/RNTesterTabsIOSComponentView.mm

@@ -22,9 +22,8 @@
 
 using namespace facebook::react;
 
-// Preserve RNTester's existing example bounds on compact bottom-tab layouts.
+// Preserve RNTester's existing example top bound on compact bottom-tab layouts.
 static constexpr CGFloat LegacyTopInset = 50;
-static constexpr CGFloat LegacyBottomInset = 65;
 
 /**
  * A tab's view controller, which reports when the tab bar or window changes
@@ -221,7 +220,7 @@ - (void)tabSafeAreaInsetsDidChange:(UIEdgeInsets)insets
       CGRectGetMaxY(tabBarFrame) >= CGRectGetMaxY(bounds);
   if (hasBottomTabBar) {
     insets.top = MAX(insets.top, LegacyTopInset);
-    insets.bottom = MIN(insets.bottom, LegacyBottomInset);
+    // Keep the full bottom inset: anything less leaves content under the tab bar, where taps switch tabs.
   } else {
     insets.bottom = 0;
     // A window with no status bar along the top, such as the iPhone Duo's, reports no top inset. Keep