improve android navigation bar

lib/components/scroll.dart

@@ -16,7 +16,14 @@ class SmoothCustomScrollView extends StatelessWidget {
         return CustomScrollView(
           controller: controller,
           physics: physics,
-          slivers: slivers,
+          slivers: [
+            ...slivers,
+            SliverPadding(
+              padding: EdgeInsets.only(
+                bottom: context.padding.bottom,
+              ),
+            ),
+          ],
         );
       },
     );

lib/main.dart

@@ -178,11 +178,13 @@ class _SystemUiProvider extends StatelessWidget {
       systemUiStyle = SystemUiOverlayStyle.dark.copyWith(
         statusBarColor: Colors.transparent,
         systemNavigationBarColor: Colors.transparent,
+        systemNavigationBarIconBrightness: Brightness.dark,
       );
     } else {
       systemUiStyle = SystemUiOverlayStyle.light.copyWith(
         statusBarColor: Colors.transparent,
         systemNavigationBarColor: Colors.transparent,
+        systemNavigationBarIconBrightness: Brightness.light,
       );
     }
     return AnnotatedRegion<SystemUiOverlayStyle>(

lib/pages/reader/scaffold.dart

@@ -107,6 +107,11 @@ class _ReaderScaffoldState extends State<_ReaderScaffold> {
   }
 
   void openOrClose() {
+    if(!_isOpen) {
+      SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
+    } else {
+      SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersive);
+    }
     setState(() {
       _isOpen = !_isOpen;
     });
@@ -142,10 +147,9 @@ class _ReaderScaffoldState extends State<_ReaderScaffold> {
         ),
         AnimatedPositioned(
           duration: const Duration(milliseconds: 180),
-          bottom: _isOpen ? 0 : -(kBottomBarHeight + context.padding.bottom),
+          bottom: _isOpen ? 0 : -kBottomBarHeight,
           left: 0,
           right: 0,
-          height: kBottomBarHeight + context.padding.bottom,
           child: buildBottom(),
         ),
       ],
@@ -200,7 +204,7 @@ class _ReaderScaffoldState extends State<_ReaderScaffold> {
     }
 
     Widget child = SizedBox(
-      height: kBottomBarHeight + MediaQuery.of(context).padding.bottom,
+      height: kBottomBarHeight,
       child: Column(
         children: [
           const SizedBox(