Function getEnhancedLabel

scripts/content.js:445–556

* 获取增强的标签信息

(element)

 * 获取增强的标签信息
 */
function getEnhancedLabel(element) {
    let labelText = '';
    let labelSource = '';
    const id = element.id;

    // 1. 查找 <label for="id">
    if (id) {
        const label = document.querySelector(`label[for="${id}"]`);
        if (label) {
            labelText = label.innerText.trim();
            labelSource = 'label-for';
        }
    }

    // 2. 查找父级 <label>
    if (!labelText) {
        const parentLabel = element.closest('label');
        if (parentLabel) {
            labelText = parentLabel.innerText.trim();
            labelSource = 'parent-label';
        }
    }

    // 3. aria-label
    if (!labelText) {
        const ariaLabel = element.getAttribute('aria-label');
        if (ariaLabel) {
            labelText = ariaLabel;
            labelSource = 'aria-label';
        }
    }

    // 4. aria-labelledby
    if (!labelText) {
        const labelledBy = element.getAttribute('aria-labelledby');
        if (labelledBy) {
            const labelEl = document.getElementById(labelledBy);
            if (labelEl) {
                labelText = labelEl.innerText.trim();
                labelSource = 'aria-labelledby';
            }
        }
    }

    // 5. aria-describedby (作为补充上下文)
    if (!labelText) {
        const describedBy = element.getAttribute('aria-describedby');
        if (describedBy) {
            const descEl = document.getElementById(describedBy);
            if (descEl) {
                labelText = descEl.innerText.trim();
                labelSource = 'aria-describedby';
            }
        }
    }

    // 6. title 属性
    if (!labelText) {