移动端搜索框边框优化与桌面小部件路径配置

class _WidgetSettingsSectionState extends State<_WidgetSettingsSection> {
  String? _defaultSavePath;  // 笔记保存目录
  String? _fileSavePath;     // 文件保存目录 ✅ 新增
  bool _isLoading = true;
  
  Future<void> _loadSettings() async {
    final service = WidgetService();
    final notePath = await service.getDefaultSavePath();
    final filePath = await service.getFileSavePath(); // ✅ 新增
    
    if (mounted) {
      setState(() {
        _defaultSavePath = notePath;
        _fileSavePath = filePath; // ✅ 新增
        _isLoading = false;
      });
    }
  }
}

return Column(
  children: [
    // 笔记保存目录 ✅ 原有功能优化
    ListTile(
      leading: Icon(TablerIcons.pencil), // ✅ 改为铅笔图标
      title: const Text('笔记保存目录'),
      subtitle: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(pathDisplayText),
          const SizedBox(height: 2),
          Text(
            '桌面小部件快速笔记功能的默认保存位置', // ✅ 添加说明文字
            style: TextStyle(fontSize: 12, color: onSurfaceVariant),
          ),
        ],
      ),
      trailing: const Icon(TablerIcons.chevron_right),
      onTap: _pickDefaultSavePath,
    ),
    
    const Divider(height: 1),
    
    // 文件保存目录 ✅ 新增功能
    ListTile(
      leading: Icon(TablerIcons.folder), // 文件夹图标
      title: const Text('文件保存目录'),
      subtitle: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(filePathDisplayText),
          const SizedBox(height: 2),
          Text(
            '桌面小部件快速上传功能的默认保存位置', // ✅ 添加说明文字
            style: TextStyle(fontSize: 12, color: onSurfaceVariant),
          ),
        ],
      ),
      trailing: const Icon(TablerIcons.chevron_right),
      onTap: _pickFileSavePath, // ✅ 新增方法
    ),
    
    const Divider(height: 1),
    
    // 原有的小部件列表项
    ListTile(...),
  ],
);

Future<void> _pickFileSavePath() async {
  // 复用原有的文件夹选择逻辑
  final appState = context.read<AppState>();
  final folders = appState.files
      .where((f) => f.isDir)
      .map((f) => f.name)
      .toList();
  
  folders.insert(0, '/'); // 添加根目录选项
  
  final selected = await showModalBottomSheet<String>(
    context: context,
    isScrollControlled: true,
    builder: (ctx) {
      return DraggableScrollableSheet(
        initialChildSize: 0.5,
        minChildSize: 0.3,
        maxChildSize: 0.8,
        expand: false,
        builder: (ctx, scrollController) {
          return Column(
            children: [
              Padding(
                padding: const EdgeInsets.all(16),
                child: Text(
                  '选择文件保存目录', // ✅ 不同的标题
                  style: Theme.of(ctx).textTheme.titleMedium,
                ),
              ),
              Expanded(
                child: ListView.builder(
                  controller: scrollController,
                  itemCount: folders.length,
                  itemBuilder: (ctx, index) {
                    final folder = folders[index];
                    final isSelected = folder == (_fileSavePath ?? '/');
                    return ListTile(
                      leading: Icon(
                        folder == '/' ? TablerIcons.home : TablerIcons.folder,
                        color: isSelected ? Theme.of(ctx).colorScheme.primary : null,
                      ),
                      title: Text(
                        folder == '/' ? '根目录' : folder,
                        style: TextStyle(
                          color: isSelected ? Theme.of(ctx).colorScheme.primary : null,
                          fontWeight: isSelected ? FontWeight.bold : null,
                        ),
                      ),
                      trailing: isSelected ? Icon(
                        TablerIcons.check,
                        color: Theme.of(ctx).colorScheme.primary,
                      ) : null,
                      onTap: () => Navigator.pop(ctx, folder),
                    );
                  },
                ),
              ),
            ],
          );
        },
      );
    },
  );
  
  if (selected != null) {
    await WidgetService().setFileSavePath(selected); // ✅ 调用新方法
    setState(() {
      _fileSavePath = selected;
    });
    if (mounted) {
      showAppToast(context, '已设置文件保存目录'); // ✅ 不同的提示
    }
  }
}