feat: [xps] harmonize metadata fields and outline diagnostics

[LiHua000]

align XPS core property keys with DocSheet expectations and drop hardcoded fallbacks to restore keyword exposure in file info

prefer document-supplied author/keyword metadata in DocSheet, logging owner-based fallbacks for traceability

add debugging hooks for missing XPS core properties and empty outline structures to ease QA validation

task:https://pms.uniontech.com/task-view-383459.html

[deepin-ci-robot]

deepin pr auto review

我来对这段代码的修改进行审查分析：

1. 代码逻辑改进：

• 将normalizedString的默认fallback参数从"未知"改为空字符串更合理，避免硬编码
• 增加了更详细的日志记录，有助于调试和问题追踪
• 改进了作者(author)和关键词(keywords)的处理逻辑，增加了多个备选值的检查

2. 代码质量提升：

• 使用lambda表达式(setPropertyWithLog)提高了代码复用性
• 增加了更多的错误处理和边界条件检查
• 统一了属性键名的命名规范(如"KeyWords"改为"Keywords")

3. 性能优化：

• 没有明显的性能问题，修改主要是增加日志和错误处理
• 使用QStringLiteral处理字符串字面量，提高运行时效率

4. 安全性考虑：

• 增加了对空值和无效数据的检查
• 使用了更安全的字符串处理方式
• 日志记录有助于追踪潜在问题

具体建议：

1. 对于normalizedString函数：

QString normalizedString(const gchar *value, const QString &fallback = QString())
{
    if (!value) return fallback;  // 增加空指针检查
    QString result = QString::fromUtf8(value).trimmed();
    return result.isEmpty() ? fallback : result;
}

2. 对于ensureProperties函数中的setPropertyWithLog lambda：

const auto setPropertyWithLog = [&](const QString &key, const gchar *value) {
    if (!value) {  // 增加空指针检查
        qCDebug(appLog) << "XPS metadata missing field:" << key;
        return;
    }
    const QString text = normalizedString(value);
    if (text.isEmpty()) {
        qCDebug(appLog) << "XPS metadata empty field:" << key;
    }
    props[key] = text;
};

3. 对于作者信息的处理：

QString author = propertys.value("Author").toString();
if (author.isEmpty()) {
    author = propertys.value("Creator").toString();
}
if (author.isEmpty()) {
    author = fileInfo.owner();
    if (!author.isEmpty()) {  // 增加非空检查
        qCDebug(appLog) << "Using file owner as fallback author for document";
    }
}
tFileInfo.auther = author;

这些修改提高了代码的健壮性和可维护性，同时增加了更多的错误处理和日志记录，有助于问题诊断和调试。整体来看，这是一次积极的代码改进。

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: LiHua000, lzwind

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[LiHua000]

/forcemerge