feat: align shared app foundations

lib/common/router/app_router.dart

@@ -54,22 +54,43 @@ final routerProvider = Provider<GoRouter>((ref) {
       return null;
     },
     routes: [
-      ShellRoute(
-        builder: (context, state, child) =>
-            TabShell(location: state.matchedLocation, child: child),
-        routes: [
-          GoRoute(
-            path: AppRoutes.assets,
-            builder: (ctx, s) => const AssetsPage(),
+      StatefulShellRoute.indexedStack(
+        builder: (context, state, navigationShell) => TabShell(
+          location: state.matchedLocation,
+          navigationShell: navigationShell,
+        ),
+        branches: [
+          StatefulShellBranch(
+            routes: [
+              GoRoute(
+                path: AppRoutes.assets,
+                builder: (ctx, s) => const AssetsPage(),
+              ),
+            ],
           ),
-          GoRoute(
-            path: AppRoutes.market,
-            builder: (ctx, s) => const MarketPage(),
+          StatefulShellBranch(
+            routes: [
+              GoRoute(
+                path: AppRoutes.market,
+                builder: (ctx, s) => const MarketPage(),
+              ),
+            ],
           ),
-          GoRoute(path: AppRoutes.news, builder: (ctx, s) => const NewsPage()),
-          GoRoute(
-            path: AppRoutes.profile,
-            builder: (ctx, s) => const ProfilePage(),
+          StatefulShellBranch(
+            routes: [
+              GoRoute(
+                path: AppRoutes.news,
+                builder: (ctx, s) => const NewsPage(),
+              ),
+            ],
+          ),
+          StatefulShellBranch(
+            routes: [
+              GoRoute(
+                path: AppRoutes.profile,
+                builder: (ctx, s) => const ProfilePage(),
+              ),
+            ],
           ),
         ],
       ),

lib/common/router/tab_shell.dart

@@ -8,9 +8,13 @@ import '../widgets/adaptive.dart';
 import 'app_router.dart';
 
 class TabShell extends StatefulWidget {
-  const TabShell({super.key, required this.child, required this.location});
+  const TabShell({
+    super.key,
+    required this.navigationShell,
+    required this.location,
+  });
 
-  final Widget child;
+  final StatefulNavigationShell navigationShell;
   final String location;
 
   @override
@@ -22,10 +26,7 @@ class _TabShellState extends State<TabShell> {
 
   bool _showCompactHeader = false;
 
-  static const _tabs = ['/assets', '/market', '/news', '/profile'];
-
-  int get _index =>
-      _tabs.indexWhere((t) => widget.location.startsWith(t)).clamp(0, 3);
+  int get _index => widget.navigationShell.currentIndex;
 
   @override
   void didUpdateWidget(covariant TabShell oldWidget) {
@@ -104,7 +105,7 @@ class _TabShellState extends State<TabShell> {
               color: cs.background,
               child: NotificationListener<ScrollNotification>(
                 onNotification: _handleScrollNotification,
-                child: Stack(children: [Positioned.fill(child: widget.child)]),
+                child: widget.navigationShell,
               ),
             ),
             bottomNavigationBar: SafeArea(
@@ -129,7 +130,7 @@ class _TabShellState extends State<TabShell> {
                           ),
                           child: Row(
                             children: [
-                              for (var i = 0; i < _tabs.length; i++)
+                              for (var i = 0; i < _labels.length; i++)
                                 Expanded(
                                   child: _TabButton(
                                     icon: i == _index
@@ -137,7 +138,11 @@ class _TabShellState extends State<TabShell> {
                                         : _outlineIcons[i],
                                     label: _labels[i],
                                     selected: i == _index,
-                                    onTap: () => context.go(_tabs[i]),
+                                    onTap: () =>
+                                        widget.navigationShell.goBranch(
+                                          i,
+                                          initialLocation: i == _index,
+                                        ),
                                   ),
                                 ),
                             ],