feat(barcode): add scanner, upd flutter version in ci

lib/features/diary/presentation/pages/barcode_scanner_screen.dart

@@ -0,0 +1,87 @@
+import 'package:flutter/material.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+
+class BarcodeScannerScreen extends StatefulWidget {
+  const BarcodeScannerScreen({super.key});
+
+  @override
+  State<BarcodeScannerScreen> createState() => _BarcodeScannerScreenState();
+}
+
+class _BarcodeScannerScreenState extends State<BarcodeScannerScreen> {
+  final MobileScannerController _controller = MobileScannerController();
+  String? _detectedBarcode;
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Сканирование штрихкода'),
+        centerTitle: true,
+      ),
+      body: Column(
+        children: [
+          Expanded(
+            child: MobileScanner(
+              controller: _controller,
+              onDetect: (capture) {
+                final List<Barcode> barcodes = capture.barcodes;
+                if (barcodes.isEmpty) return;
+                final rawValue = barcodes.first.rawValue;
+                if (rawValue == null || rawValue == _detectedBarcode) return;
+                setState(() {
+                  _detectedBarcode = rawValue;
+                });
+              },
+            ),
+          ),
+          Container(
+            width: double.infinity,
+            padding: const EdgeInsets.all(16),
+            decoration: const BoxDecoration(
+              color: Color(0xFFF6F6F6),
+              borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
+            ),
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                const Text(
+                  'Найденный штрихкод',
+                  style: TextStyle(fontSize: 16, fontWeight: FontWeight.w500),
+                ),
+                const SizedBox(height: 8),
+                Text(
+                  _detectedBarcode ?? 'Наведите камеру на штрихкод',
+                  textAlign: TextAlign.center,
+                  style: TextStyle(
+                    fontSize: 18,
+                    fontWeight: FontWeight.w600,
+                    color: _detectedBarcode == null ? Colors.grey : Colors.black,
+                  ),
+                ),
+                const SizedBox(height: 16),
+                if (_detectedBarcode != null)
+                  SizedBox(
+                    width: double.infinity,
+                    child: ElevatedButton(
+                      onPressed: () {
+                        Navigator.of(context).pop(_detectedBarcode);
+                      },
+                      child: const Text('Использовать штрихкод'),
+                    ),
+                  ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+