fix(ui): normalize invalid available size to dash in size info widget

[GongHeng2017]

When m_availableSize contains a "-" (e.g. from negative value formatting), normalize it to "-" to avoid displaying invalid available space.

当可用空间值含"-"（如负值格式化结果）时，将其统一为"-"，避免显示无效的可用空间值。

Log: 修复可用空间显示含"-"的异常值
PMS: BUG-204631
Influence: 修复后分区信息中可用空间显示为"-"而非负值，避免界面显示异常。

Summary by Sourcery

Bug Fixes:

• Normalize invalid available-size values containing a dash to display as a single dash in the size information widget.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

The size information widget now converts available-size values containing a hyphen into a standalone “-” before painting, ensuring invalid or negative formatted values are shown as unavailable space rather than displayed directly.

File-Level Changes

Change	Details	Files
Normalize invalid available-size text before rendering the size information widget.	Detect a hyphen anywhere in the available-size string. Replace the value with a standalone dash to prevent negative or otherwise invalid space values from being displayed.	application/widgets/customcontrol/sizeinfowidget.cpp

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[sourcery-ai]

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[deepin-ci-robot]

deepin pr auto review

🤖 AI 代码审查报告

总体评分： 98 分 (通过阈值: 70分)

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📊 总体评价

项目	结果
审查结论	代码审查通过
评分详情	总体评分 98 分，大于 70 分通过阈值，代码质量符合要求。本次变更修复了可用空间显示含"-"异常值的Bug，代码简洁有效，无安全漏洞。

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🔍 详细分析

1. 语法逻辑 ✅

评价： 优秀 ✅ 通过

潜在问题：
✅ 未发现明显问题

建议： 无需要修改的语法逻辑问题

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2. 代码质量 ✅

评价： 优秀 ✅ 通过

潜在问题：

1. application/widgets/customcontrol/sizeinfowidget.cpp:240 - 新增代码缺少内联注释说明规范化逻辑的目的

建议： 建议在新增代码前添加简短注释，说明规范化逻辑的目的，与commit message描述保持一致

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3. 代码性能 ✅

评价： 优秀 ✅ 通过

潜在问题：
✅ 未发现明显问题

建议： 无需性能优化，QString::contains()操作复杂度为O(n)，字符串长度通常很短（<20字符），在paintEvent中的开销可忽略不计

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4. 代码安全 🔒

评价： 优秀 ✅ 通过

🔐 发现 0 个安全漏洞

安全漏洞详情：
✅ 未发现安全漏洞

建议： 无安全风险，代码仅处理内部成员变量的字符串显示，不涉及用户输入、文件操作或网络通信

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💡 改进建议代码示例

// 绘制首页下方标注
if (m_flag) {
    DGuiApplicationHelper::ColorType themeType = DGuiApplicationHelper::instance()->themeType();
    // 规范化可用空间显示，避免负值格式化结果显示异常
    if (m_availableSize.contains("-"))
        m_availableSize = "-";
    if (themeType == DGuiApplicationHelper::LightType) {

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本报告由 AI 代码审查工具自动生成

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: GongHeng2017, max-lvs

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[GongHeng2017]

/merge