refactor: enhance child route management in ClientPaths and StaffPaths; ensure proper handling of empty child paths

apps/mobile/packages/core/lib/src/routing/client/navigator.dart

@@ -48,7 +48,7 @@ extension ClientNavigator on IModularNavigator {
   /// This is typically called after successful authentication or when
   /// returning to the main application from a deep feature.
   ///
-  /// Uses absolute navigation to ensure proper routing from any context.
+  /// Uses pushNamed to avoid trailing slash issues with navigate().
   void toClientHome() {
     navigate(ClientPaths.home);
   }

apps/mobile/packages/core/lib/src/routing/client/route_paths.dart

@@ -16,7 +16,21 @@ class ClientPaths {
   /// Generate child route based on the given route and parent route
   ///
   /// This is useful for creating nested routes within modules.
-  static String childRoute(String parent, String child) => child.replaceFirst(parent, '');
+  static String childRoute(String parent, String child)  {
+    final String childPath = child.replaceFirst(parent, '');
+    
+    // check if the child path is empty
+    if (childPath.isEmpty) {
+      return '/';
+    } 
+    
+    // ensure the child path starts with a '/'
+    if (!childPath.startsWith('/')) {
+      return '/$childPath';
+    }
+
+    return childPath;
+  }
 
   // ==========================================================================
   // AUTHENTICATION

apps/mobile/packages/core/lib/src/routing/staff/route_paths.dart

@@ -16,8 +16,22 @@ class StaffPaths {
   /// Generate child route based on the given route and parent route
   ///
   /// This is useful for creating nested routes within modules.
-  static String childRoute(String parent, String child) => child.replaceFirst(parent, '');
+  static String childRoute(String parent, String child)  {
+    final String childPath = child.replaceFirst(parent, '');
+    
+    // check if the child path is empty
+    if (childPath.isEmpty) {
+      return '/';
+    } 
+    
+    // ensure the child path starts with a '/'
+    if (!childPath.startsWith('/')) {
+      return '/$childPath';
+    }
 
+    return childPath;
+  }
+  
   // ==========================================================================
   // AUTHENTICATION
   // ==========================================================================
@@ -93,7 +107,8 @@ class StaffPaths {
   /// Personal information onboarding.
   ///
   /// Collect basic personal information during staff onboarding.
-  static const String onboardingPersonalInfo = '/worker-main/onboarding/personal-info';
+  static const String onboardingPersonalInfo =
+      '/worker-main/onboarding/personal-info';
 
   /// Emergency contact information.
   ///