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_unit4.json

@@ -0,0 +1,8 @@
+[
+  {"action": "snapshot", "max_elements": 300},
+  {"action": "click", "ref": 118, "note": "单位性质"},
+  {"action": "wait", "wait_seconds": 2},
+  {"action": "click", "selector": "text=\"机关团体-社会团体\"", "note": "单位性质选项"},
+  {"action": "wait", "wait_seconds": 1},
+  {"action": "eval_js", "js": "(() => { const nz = Array.from(document.querySelectorAll('nz-select')).filter(e => (e.textContent||'').includes('机关团体-社会团体')); return '选中: ' + nz.length + ' 个'; })()"}
+]