fix(router): unique navigatorKey per StatefulShellBranch to avoid duplicate GlobalKey crash

apps/mobile_app/lib/navigation/app_router.dart

@@ -22,6 +22,25 @@ import 'package:splash/splash.dart';
 
 final GlobalKey<NavigatorState> rootNavigatorKey = GlobalKey<NavigatorState>();
 
+final _legacyControlPanelNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'legacyControlPanel');
+final _legacyDeviceMgmtNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'legacyDeviceMgmt');
+final _legacyLocationNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'legacyLocation');
+final _legacyChatNavKey = GlobalKey<NavigatorState>(debugLabel: 'legacyChat');
+final _legacySettingsNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'legacySettings');
+
+final _dashboardHomeNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'dashboardHome');
+final _dashboardActivityNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'dashboardActivity');
+final _dashboardNotificationsNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'dashboardNotifications');
+final _dashboardProfileNavKey =
+    GlobalKey<NavigatorState>(debugLabel: 'dashboardProfile');
+
 late final GoRouter appRouter;
 
 /// Maps the splash's session check result to the destination route based
@@ -60,6 +79,7 @@ void configureAppRouter() {
         },
         branches: [
           StatefulShellBranch(
+            navigatorKey: _legacyControlPanelNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.controlPanel,
@@ -108,6 +128,7 @@ void configureAppRouter() {
             ],
           ),
           StatefulShellBranch(
+            navigatorKey: _legacyDeviceMgmtNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.deviceManagement,
@@ -181,6 +202,7 @@ void configureAppRouter() {
             ],
           ),
           StatefulShellBranch(
+            navigatorKey: _legacyLocationNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.legacyLocation,
@@ -191,6 +213,7 @@ void configureAppRouter() {
           ),
           // TODO: Añadir branch para Chat (tab 4)
           StatefulShellBranch(
+            navigatorKey: _legacyChatNavKey,
             routes: [
               GoRoute(
                 path: '${AppRoutes.legacyDashboard}/chat',
@@ -205,6 +228,7 @@ void configureAppRouter() {
             ],
           ),
           StatefulShellBranch(
+            navigatorKey: _legacySettingsNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.settings,
@@ -380,6 +404,7 @@ void configureAppRouter() {
         },
         branches: [
           StatefulShellBranch(
+            navigatorKey: _dashboardHomeNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.dashboardHome,
@@ -448,6 +473,7 @@ void configureAppRouter() {
             ],
           ),
           StatefulShellBranch(
+            navigatorKey: _dashboardActivityNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.dashboardActivity,
@@ -457,6 +483,7 @@ void configureAppRouter() {
             ],
           ),
           StatefulShellBranch(
+            navigatorKey: _dashboardNotificationsNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.dashboardNotifications,
@@ -466,6 +493,7 @@ void configureAppRouter() {
             ],
           ),
           StatefulShellBranch(
+            navigatorKey: _dashboardProfileNavKey,
             routes: [
               GoRoute(
                 path: AppRoutes.dashboardProfile,