feat: implement mobile upload screen with camera and file picker functionality

lib/core/widgets/mobile_upload_screen.dart

@@ -0,0 +1,117 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:image_picker/image_picker.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:flux/features/customers/blocs/customer_files_bloc.dart';
+
+class MobileUploadScreen extends StatelessWidget {
+  final String customerId;
+  final String customerName;
+
+  const MobileUploadScreen({
+    super.key,
+    required this.customerId,
+    required this.customerName,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return BlocListener<CustomerFilesBloc, CustomerFilesState>(
+      listener: (context, state) {
+        if (state.status == CustomerFilesStatus.success) {
+          ScaffoldMessenger.of(
+            context,
+          ).showSnackBar(const SnackBar(content: Text("File caricato! ✅")));
+        }
+        if (state.status == CustomerFilesStatus.failure) {
+          ScaffoldMessenger.of(
+            context,
+          ).showSnackBar(SnackBar(content: Text("Errore: ${state.error}")));
+        }
+      },
+      child: Scaffold(
+        appBar: AppBar(title: Text("Upload: $customerName")),
+        body: Padding(
+          padding: const EdgeInsets.all(24.0),
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              _UploadButton(
+                title: "SCATTA FOTO",
+                icon: Icons.camera_alt_rounded,
+                onTap: () => _handleCamera(context),
+              ),
+              const SizedBox(height: 20),
+              _UploadButton(
+                title: "CARICA DA MEMORIA",
+                icon: Icons.file_present_rounded,
+                onTap: () => _handleFilePicker(context),
+                isSecondary: true,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _handleCamera(BuildContext context) async {
+    final picker = ImagePicker();
+    final photo = await picker.pickImage(
+      source: ImageSource.camera,
+      imageQuality: 80,
+    );
+    if (photo != null && context.mounted) {
+      context.read<CustomerFilesBloc>().add(
+        UploadCustomerFileEvent(photo: File(photo.path)),
+      );
+    }
+  }
+
+  Future<void> _handleFilePicker(BuildContext context) async {
+    final result = await FilePicker.pickFiles(withData: true);
+    if (result != null && context.mounted) {
+      context.read<CustomerFilesBloc>().add(
+        UploadCustomerFileEvent(pickedFile: result.files.first),
+      );
+    }
+  }
+}
+
+class _UploadButton extends StatelessWidget {
+  final String title;
+  final IconData icon;
+  final VoidCallback onTap;
+  final bool isSecondary;
+
+  const _UploadButton({
+    required this.title,
+    required this.icon,
+    required this.onTap,
+    this.isSecondary = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return SizedBox(
+      width: double.infinity,
+      height: 80,
+      child: ElevatedButton.icon(
+        onPressed: onTap,
+        icon: Icon(icon, size: 28),
+        label: Text(
+          title,
+          style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+        ),
+        style: ElevatedButton.styleFrom(
+          backgroundColor: isSecondary ? Colors.grey[200] : null,
+          foregroundColor: isSecondary ? Colors.black87 : null,
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+        ),
+      ),
+    );
+  }
+}