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_unit6.json

@@ -0,0 +1,6 @@
+[
+  {"action": "snapshot", "max_elements": 300},
+  {"action": "click", "selector": "nz-select:has([ng-reflect-name]) >> text=\"机关团体\"", "note": "定位单位性质"},
+  {"action": "wait", "wait_seconds": 2},
+  {"action": "eval_js", "js": "(() => { const lis = Array.from(document.querySelectorAll('.ant-select-dropdown-menu-item')).filter(e => e.offsetParent).map(e => e.textContent.trim().slice(0, 25)); return JSON.stringify(lis.slice(0, 8)); })()"}
+]