feat: Implement user-specific addresses

lib/models/delivery_address.dart

@@ -2,6 +2,7 @@ import 'package:uuid/uuid.dart';
 
 class DeliveryAddress {
   final String id;
+  final String userId;
   final String streetAddress;
   final String city;
   final String state;
@@ -13,6 +14,7 @@ class DeliveryAddress {
 
   DeliveryAddress({
     String? id,
+    required this.userId,
     required this.streetAddress,
     required this.city,
     required this.state,
@@ -30,6 +32,7 @@ class DeliveryAddress {
 
   Map<String, dynamic> toJson() => {
     'id': id,
+    'userId': userId,
     'streetAddress': streetAddress,
     'city': city,
     'state': state,
@@ -42,6 +45,7 @@ class DeliveryAddress {
 
   factory DeliveryAddress.fromJson(Map<String, dynamic> json) => DeliveryAddress(
     id: json['id'],
+    userId: json['userId'],
     streetAddress: json['streetAddress'],
     city: json['city'],
     state: json['state'],
@@ -53,6 +57,7 @@ class DeliveryAddress {
   );
 
   DeliveryAddress copyWith({
+    String? userId,
     String? streetAddress,
     String? city,
     String? state,
@@ -62,6 +67,7 @@ class DeliveryAddress {
     String? notes,
   }) => DeliveryAddress(
     id: id,
+    userId: userId ?? this.userId,
     streetAddress: streetAddress ?? this.streetAddress,
     city: city ?? this.city,
     state: state ?? this.state,

lib/screens/admin_dashboard_screen.dart

@@ -40,16 +40,22 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
   }
 
   void _showAddEditAddressDialog({DeliveryAddress? address}) {
+    if (_user == null) return;
     showDialog(
       context: context,
       builder: (context) => AddEditAddressDialog(
         address: address,
-        onSave: (address) => _firestoreService.saveAddress(address),
+        userId: _user!.uid,
+        onSave: (address) {
+          _firestoreService.saveAddress(address);
+        },
       ),
     );
   }
 
   Future<void> _showUploadCsvDialog() async {
+    if (_user == null) return;
+
     try {
       final result = await FilePicker.platform.pickFiles(
         type: FileType.custom,
@@ -72,6 +78,7 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
       final addresses = list.map((row) {
         try {
           return DeliveryAddress(
+            userId: _user!.uid,
             streetAddress: row[0].toString(),
             city: row[1].toString(),
             state: row[2].toString(),
@@ -194,6 +201,9 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
   }
 
   Widget _buildLoggedInView(BuildContext context) {
+    if (_user == null) {
+      return const Center(child: CircularProgressIndicator());
+    }
     return Padding(
       padding: const EdgeInsets.all(16.0),
       child: Column(
@@ -229,7 +239,7 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
             child: AddressList(
               onEdit: (address) => _showAddEditAddressDialog(address: address),
               onDelete: _deleteAddress,
-              addressesStream: _firestoreService.getAddresses(),
+              addressesStream: _firestoreService.getAddresses(_user!.uid),
             ),
           ),
           const SizedBox(height: 16),

lib/services/firestore_service.dart

@@ -5,10 +5,14 @@ class FirestoreService {
   final FirebaseFirestore _db = FirebaseFirestore.instance;
   final String _collectionPath = 'addresses';
 
-  // Get a stream of all addresses
-  Stream<List<DeliveryAddress>> getAddresses() {
-    return _db.collection(_collectionPath).snapshots().map((snapshot) =>
-        snapshot.docs.map((doc) => DeliveryAddress.fromJson(doc.data())).toList());
+  // Get a stream of addresses for a specific user
+  Stream<List<DeliveryAddress>> getAddresses(String userId) {
+    return _db
+        .collection(_collectionPath)
+        .where('userId', isEqualTo: userId)
+        .snapshots()
+        .map((snapshot) =>
+            snapshot.docs.map((doc) => DeliveryAddress.fromJson(doc.data())).toList());
   }
 
   // Add or update an address

lib/widgets/add_edit_address_dialog.dart

@@ -3,9 +3,15 @@ import '../models/delivery_address.dart';
 
 class AddEditAddressDialog extends StatefulWidget {
   final DeliveryAddress? address;
+  final String userId;
   final Function(DeliveryAddress) onSave;
 
-  const AddEditAddressDialog({super.key, this.address, required this.onSave});
+  const AddEditAddressDialog({
+    super.key,
+    this.address,
+    required this.userId,
+    required this.onSave,
+  });
 
   @override
   State<AddEditAddressDialog> createState() => _AddEditAddressDialogState();
@@ -98,6 +104,7 @@ class _AddEditAddressDialogState extends State<AddEditAddressDialog> {
     if (_formKey.currentState!.validate()) {
       final address = DeliveryAddress(
         id: widget.address?.id, // Keep original ID if editing
+        userId: widget.userId,
         streetAddress: _streetController.text,
         city: _cityController.text,
         state: _stateController.text,