feat: add sound and vibration feedback for registration actions

Integrate audioplayers, vibration, and file_picker packages to provide
audio/haptic feedback on registration success/failure. Add sound
settings UI in SettingsPage for customizing notification sounds.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/pages/settings_page.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:file_picker/file_picker.dart';
 import 'package:pad_scanner/services/api_service.dart';
+import 'package:pad_scanner/services/sound_service.dart';
 
 class SettingsPage extends StatefulWidget {
   const SettingsPage({super.key});
@@ -12,13 +14,18 @@ class SettingsPage extends StatefulWidget {
 class _SettingsPageState extends State<SettingsPage> {
   final _controller = TextEditingController();
   final _apiService = ApiService();
+  final _soundService = SoundService();
   bool _saving = false;
   bool _testing = false;
 
+  String? _successPath;
+  String? _failurePath;
+
   @override
   void initState() {
     super.initState();
     _loadUrl();
+    _loadSoundPaths();
   }
 
   Future<void> _loadUrl() async {
@@ -27,6 +34,17 @@ class _SettingsPageState extends State<SettingsPage> {
     _controller.text = url;
   }
 
+  Future<void> _loadSoundPaths() async {
+    final s = await _soundService.getSuccessPath();
+    final f = await _soundService.getFailurePath();
+    if (mounted) {
+      setState(() {
+        _successPath = s;
+        _failurePath = f;
+      });
+    }
+  }
+
   Future<void> _saveUrl() async {
     final url = _controller.text.trim();
     if (url.isEmpty) {
@@ -59,11 +77,57 @@ class _SettingsPageState extends State<SettingsPage> {
     }
   }
 
+  Future<void> _pickSound(bool isSuccess) async {
+    final result = await FilePicker.pickFiles(
+      type: FileType.audio,
+    );
+    if (result != null && result.files.single.path != null) {
+      final path = result.files.single.path!;
+      if (isSuccess) {
+        await _soundService.setSuccessPath(path);
+      } else {
+        await _soundService.setFailurePath(path);
+      }
+      setState(() {
+        if (isSuccess) {
+          _successPath = path;
+        } else {
+          _failurePath = path;
+        }
+      });
+    }
+  }
+
+  Future<void> _clearSound(bool isSuccess) async {
+    if (isSuccess) {
+      await _soundService.setSuccessPath(null);
+    } else {
+      await _soundService.setFailurePath(null);
+    }
+    setState(() {
+      if (isSuccess) {
+        _successPath = null;
+      } else {
+        _failurePath = null;
+      }
+    });
+  }
+
+  Future<void> _previewSound(String path) async {
+    await _soundService.play(path);
+  }
+
+  String _fileName(String? path) {
+    if (path == null) return '未设置';
+    return path.split('/').last;
+  }
+
   void _showSnackBar(String message, {bool isError = false}) {
     ScaffoldMessenger.of(context).showSnackBar(
       SnackBar(
         content: Text(message),
-        backgroundColor: isError ? Colors.red.shade700 : Colors.green.shade700,
+        backgroundColor:
+            isError ? Colors.red.shade700 : Colors.green.shade700,
         duration: const Duration(seconds: 2),
       ),
     );
@@ -72,6 +136,7 @@ class _SettingsPageState extends State<SettingsPage> {
   @override
   void dispose() {
     _controller.dispose();
+    _soundService.dispose();
     super.dispose();
   }
 
@@ -79,11 +144,12 @@ class _SettingsPageState extends State<SettingsPage> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(title: const Text('设置')),
-      body: Padding(
+      body: SingleChildScrollView(
         padding: const EdgeInsets.all(16),
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.stretch,
           children: [
+            // ---- API 地址 ----
             const Text('API 服务器地址', style: TextStyle(fontSize: 14)),
             const SizedBox(height: 8),
             TextField(
@@ -118,9 +184,99 @@ class _SettingsPageState extends State<SettingsPage> {
                   : const Icon(Icons.wifi),
               label: const Text('测试连接'),
             ),
+
+            const SizedBox(height: 24),
+
+            // ---- 铃声设置 ----
+            const Divider(),
+            const SizedBox(height: 8),
+            const Text('铃声设置',
+                style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
+            const SizedBox(height: 16),
+
+            // 上架成功铃声
+            _buildSoundRow(
+              label: '上架成功铃声',
+              path: _successPath,
+              onPick: () => _pickSound(true),
+              onPreview: _successPath != null
+                  ? () => _previewSound(_successPath!)
+                  : null,
+              onClear: _successPath != null ? () => _clearSound(true) : null,
+            ),
+
+            const SizedBox(height: 12),
+
+            // 上架失败铃声
+            _buildSoundRow(
+              label: '上架失败铃声',
+              path: _failurePath,
+              onPick: () => _pickSound(false),
+              onPreview: _failurePath != null
+                  ? () => _previewSound(_failurePath!)
+                  : null,
+              onClear:
+                  _failurePath != null ? () => _clearSound(false) : null,
+            ),
           ],
         ),
       ),
     );
   }
+
+  Widget _buildSoundRow({
+    required String label,
+    required String? path,
+    required VoidCallback onPick,
+    required VoidCallback? onPreview,
+    required VoidCallback? onClear,
+  }) {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(label, style: const TextStyle(fontSize: 14)),
+        const SizedBox(height: 6),
+        Row(
+          children: [
+            Expanded(
+              child: Container(
+                padding:
+                    const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
+                decoration: BoxDecoration(
+                  border: Border.all(color: Colors.grey.shade400),
+                  borderRadius: BorderRadius.circular(8),
+                ),
+                child: Text(
+                  _fileName(path),
+                  style: TextStyle(
+                    fontSize: 13,
+                    color: path != null ? Colors.black87 : Colors.grey,
+                  ),
+                  overflow: TextOverflow.ellipsis,
+                ),
+              ),
+            ),
+            const SizedBox(width: 8),
+            IconButton(
+              icon: const Icon(Icons.folder_open),
+              tooltip: '选择文件',
+              onPressed: onPick,
+            ),
+            if (onPreview != null)
+              IconButton(
+                icon: const Icon(Icons.play_arrow),
+                tooltip: '试听',
+                onPressed: onPreview,
+              ),
+            if (onClear != null)
+              IconButton(
+                icon: const Icon(Icons.clear, size: 20),
+                tooltip: '清除',
+                onPressed: onClear,
+              ),
+          ],
+        ),
+      ],
+    );
+  }
 }