feat: Implement initial authentication, multi-environment support, and core app infrastructure.

lib/features/auth/presentation/widgets/role_toggle.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:real_estate_mobile/core/constants/app_colors.dart';
+
+class RoleToggle extends StatelessWidget {
+  final String selectedRole;
+  final ValueChanged<String> onChanged;
+
+  const RoleToggle({
+    super.key,
+    required this.selectedRole,
+    required this.onChanged,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      decoration: BoxDecoration(
+        color: AppColors.inputFill,
+        borderRadius: BorderRadius.circular(20),
+      ),
+      padding: const EdgeInsets.all(2),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          _buildToggleButton('User', 'USER'),
+          _buildToggleButton('Admin', 'AGENT'),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildToggleButton(String label, String role) {
+    final isSelected = selectedRole == role;
+    return GestureDetector(
+      onTap: () => onChanged(role),
+      child: AnimatedContainer(
+        duration: const Duration(milliseconds: 200),
+        padding: const EdgeInsets.symmetric(horizontal: 28, vertical: 10),
+        decoration: BoxDecoration(
+          color: isSelected ? AppColors.primaryDark : Colors.transparent,
+          borderRadius: BorderRadius.circular(20),
+        ),
+        child: Text(
+          label,
+          style: TextStyle(
+            fontFamily: 'Fractul',
+            fontSize: 14,
+            fontWeight: FontWeight.w300,
+            color: isSelected ? AppColors.inputFill : AppColors.primaryDark,
+          ),
+        ),
+      ),
+    );
+  }
+}