feat: Implement agent network management and refactor app navigation with a new AppShell component.

lib/features/agents/presentation/screens/agent_detail_screen.dart

@@ -1,13 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
-import 'package:flutter_svg/flutter_svg.dart';
 import 'package:go_router/go_router.dart';
 import 'package:real_estate_mobile/core/constants/app_colors.dart';
 import 'package:real_estate_mobile/core/widgets/s3_image.dart';
 import 'package:real_estate_mobile/features/agents/data/models/agent_profile.dart';
 import 'package:real_estate_mobile/features/agents/presentation/providers/agent_detail_provider.dart';
 import 'package:real_estate_mobile/features/auth/presentation/providers/auth_provider.dart';
-import 'package:real_estate_mobile/features/home/presentation/widgets/home_header.dart';
 
 class AgentDetailScreen extends ConsumerStatefulWidget {
   final String agentId;
@@ -41,16 +39,14 @@ class _AgentDetailScreenState extends ConsumerState<AgentDetailScreen> {
   Widget build(BuildContext context) {
     final state = ref.watch(agentDetailProvider(widget.agentId));
 
-    return Scaffold(
-      backgroundColor: Colors.white,
-      body: state.isLoading
-          ? const Center(
-              child: CircularProgressIndicator(color: AppColors.accentOrange))
-          : state.error != null
-              ? _buildError(state.error!)
-              : _buildContent(state),
-      bottomNavigationBar: _buildBottomNavBar(),
-    );
+    if (state.isLoading) {
+      return const Center(
+          child: CircularProgressIndicator(color: AppColors.accentOrange));
+    }
+    if (state.error != null) {
+      return _buildError(state.error!);
+    }
+    return _buildContent(state);
   }
 
   Widget _buildError(String error) {
@@ -86,8 +82,6 @@ class _AgentDetailScreenState extends ConsumerState<AgentDetailScreen> {
     return SingleChildScrollView(
       child: Column(
         children: [
-          SafeArea(bottom: false, child: const HomeHeader()),
-
           // ── Avatar Section ──
           const SizedBox(height: 16),
           _buildAvatarSection(agent),
@@ -1033,90 +1027,6 @@ class _AgentDetailScreenState extends ConsumerState<AgentDetailScreen> {
     );
   }
 
-  // ── Bottom Nav ──
-  Widget _buildBottomNavBar() {
-    return Container(
-      decoration: const BoxDecoration(
-        color: Colors.white,
-        border: Border(top: BorderSide(color: Color(0xFFE8E8E8), width: 1)),
-      ),
-      child: SafeArea(
-        top: false,
-        child: Padding(
-          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
-          child: Row(
-            mainAxisAlignment: MainAxisAlignment.spaceBetween,
-            children: [
-              _buildNavItem(
-                svgPath: 'assets/icons/nav_home_icon.svg',
-                fallbackIcon: Icons.home,
-                onTap: () => context.go('/home'),
-              ),
-              _buildNavItem(
-                svgPath: 'assets/icons/nav_list_icon.svg',
-                fallbackIcon: Icons.list,
-                isSelected: true,
-                onTap: () => context.go('/agents/search'),
-              ),
-              _buildNavItem(
-                svgPath: 'assets/icons/nav_messages_icon.svg',
-                fallbackIcon: Icons.chat_bubble,
-                onTap: () {
-                  if (ref.read(authProvider).status !=
-                      AuthStatus.authenticated) {
-                    context.push('/login');
-                    return;
-                  }
-                  context.go('/messages');
-                },
-              ),
-              _buildNavItem(
-                svgPath: 'assets/icons/nav_profile_icon.svg',
-                fallbackIcon: Icons.person_outline,
-                onTap: () {
-                  if (ref.read(authProvider).status !=
-                      AuthStatus.authenticated) {
-                    context.push('/login');
-                    return;
-                  }
-                  context.push('/profile');
-                },
-              ),
-            ],
-          ),
-        ),
-      ),
-    );
-  }
-
-  Widget _buildNavItem({
-    required String svgPath,
-    required IconData fallbackIcon,
-    bool isSelected = false,
-    required VoidCallback onTap,
-  }) {
-    return GestureDetector(
-      onTap: onTap,
-      behavior: HitTestBehavior.opaque,
-      child: Padding(
-        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-        child: SvgPicture.asset(
-          svgPath,
-          width: 24,
-          height: 24,
-          colorFilter: ColorFilter.mode(
-            isSelected ? AppColors.primaryDark : AppColors.accentOrange,
-            BlendMode.srcIn,
-          ),
-          placeholderBuilder: (_) => Icon(
-            fallbackIcon,
-            size: 24,
-            color: isSelected ? AppColors.primaryDark : AppColors.accentOrange,
-          ),
-        ),
-      ),
-    );
-  }
 }
 
 // ── Expandable Chips Section ──