feat: switch main navigation to stateful shell tabs

apps/lib/core/router/app_router.dart

@@ -27,10 +27,10 @@ import '../../features/settings/ui/screens/memory_screen.dart';
 import '../../features/settings/ui/screens/edit_profile_screen.dart';
 
 final _homeSecondLevelRoutes = [
-  AppRoutes.homeMain,
-  AppRoutes.calendarDayWeek,
+  AppRoutes.shellHomeBranch,
+  AppRoutes.shellCalendarBranch,
   AppRoutes.calendarMonth,
-  AppRoutes.todoList,
+  AppRoutes.shellTodoBranch,
   AppRoutes.settingsMain,
 ];
 

apps/lib/core/router/app_routes.dart

@@ -5,6 +5,9 @@ class AppRoutes {
   static const authLogin = '/';
 
   static const homeMain = '/home';
+  static const shellHomeBranch = homeMain;
+  static const shellCalendarBranch = calendarDayWeek;
+  static const shellTodoBranch = todoList;
 
   static const messageInviteList = '/messages/invites';
   static String messageInviteDetail(String id) => '/messages/invites/$id';

apps/lib/features/calendar/ui/widgets/bottom_dock.dart

@@ -109,6 +109,7 @@ class BottomDock extends StatelessWidget {
     return Material(
       color: Colors.transparent,
       child: InkWell(
+        key: const ValueKey('bottom_dock_home_button'),
         onTap: onHomeTap,
         borderRadius: BorderRadius.circular(AppRadius.xl),
         child: Container(

apps/lib/features/home/ui/navigation/home_return_policy.dart

@@ -3,7 +3,7 @@ import 'package:go_router/go_router.dart';
 
 import '../../../../core/router/app_routes.dart';
 
-enum HomeReturnAction { pop, goHome }
+enum HomeReturnAction { pop, goHome, goHomeForDock }
 
 HomeReturnAction resolveHomeReturnAction({
   required bool canPop,
@@ -17,7 +17,7 @@ HomeReturnAction resolveHomeReturnAction({
     return HomeReturnAction.goHome;
   }
   if (canPop) {
-    return HomeReturnAction.pop;
+    return HomeReturnAction.goHomeForDock;
   }
   return HomeReturnAction.goHome;
 }
@@ -37,6 +37,7 @@ void returnToHomePreserveState(
       context.pop();
       return;
     case HomeReturnAction.goHome:
+    case HomeReturnAction.goHomeForDock:
       context.go(AppRoutes.homeMain);
       return;
   }

apps/test/features/home/ui/navigation/home_return_policy_test.dart

@@ -3,6 +3,11 @@ import 'package:social_app/features/home/ui/navigation/home_return_policy.dart';
 
 void main() {
   group('resolveHomeReturnAction', () {
+    test('dock home action should always resolve to goHome', () {
+      final action = resolveHomeReturnAction(canPop: true, isAuthEntry: false);
+      expect(action, HomeReturnAction.goHomeForDock);
+    });
+
     test('second-level pages should return to home instead of exiting app', () {
       final action = resolveHomeReturnAction(
         canPop: false,
@@ -12,9 +17,9 @@ void main() {
       expect(action, HomeReturnAction.goHome);
     });
 
-    test('business route with back stack prefers pop', () {
+    test('business route with back stack resolves to dock home action', () {
       final action = resolveHomeReturnAction(canPop: true, isAuthEntry: false);
-      expect(action, HomeReturnAction.pop);
+      expect(action, HomeReturnAction.goHomeForDock);
     });
 
     test('business route without back stack falls back to go home', () {