更新压缩机制，提高前缀缓存命中率，优化UI渲染机制，提高帧数

tests/web_page/steps/v_probe2.json

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+[{"action": "snapshot", "max_elements": 300}, {"action": "click", "ref": 118, "note": "单位性质"}, {"action": "wait", "wait_seconds": 2}, {"action": "eval_js", "js": "(() => { const lis = Array.from(document.querySelectorAll('.ant-select-dropdown-menu-item')).filter(e => e.offsetParent); return JSON.stringify(lis.slice(0, 8).map(e => e.textContent.trim().replace(/\\s+/g, ' ').slice(0, 40))); })()"}]