HEL-162: 修复宽屏主从列表无法内部滚动

为 .dash-master-split 增加 grid-template-rows: minmax(0,1fr)，使 max-height 真正约束行高，左侧 7 家公司可滚可选；顺手删除无调用的 statusPill。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

web/app.js

@@ -1145,17 +1145,6 @@ function netClass(value) {
   return "";
 }
 
-function statusPill(label) {
-  if (!label || label === "—") return '<span class="meta">—</span>';
-  const map = {
-    "已完成": "pill-success",
-    "流水待补": "pill-warn",
-    "确认中": "pill-warn",
-    "未提交": "pill-danger",
-  };
-  return `<span class="pill ${map[label] || "pill-muted"}">${label}</span>`;
-}
-
 function updateDashAuditCard(audit) {
   applyAuditCounts(audit, { fromApi: true });
 }