fix(report): make density facts readable and printable

Unify reader cleanup rules, lock writer table guards, and register the exact fictional timestamp collision. Preserve existing ordinary-report safety contracts and source-data gaps.

Validation: report Node 165/165, final safety 29/29, Python 101/101, Chrome 28/28; both PDFs retain all 130 rows. Full Node 3704 tests with the same 91 baseline failures. Privacy test: 62 passed, 1 failed due to 17 protected-file READ_ERRORs; not a green gate. Build, DB, manual checklist and controlled-login gaps remain documented. User explicitly authorized staging push with these gaps disclosed.

Co-Authored-By: Claude Code <noreply@anthropic.com>

frontend/src/components/personal-report/report-fact-tables.tsx

@@ -1,7 +1,8 @@
 "use client";
 
-import { memo } from "react";
+import { memo, useEffect, useRef } from "react";
 import type { ReportFactTable } from "@/lib/report-fact-table-schema";
+import { bindFactTablePrint } from "@/lib/report-fact-table-print";
 
 const STATUS_LABELS = {
   multi_system_consensus: "多系统共识",
@@ -12,28 +13,45 @@ const STATUS_LABELS = {
   blocked: "暂不可用",
 } as const;
 
+function FactTable({ table }: { table: Pick<ReportFactTable, "title" | "columns" | "rows"> }) {
+  if (!table.rows.length) return null;
+  return (
+    <div className="personal-report-fact-table-scroll overflow-x-auto" role="region" aria-label={table.title} tabIndex={0}>
+      <table>
+        <caption className="sr-only">{table.title}</caption>
+        <thead><tr>{table.columns.map((column) => <th scope="col" key={column}>{column}</th>)}</tr></thead>
+        <tbody>{table.rows.map((row) => (
+          <tr key={row.sourcePath}>{row.cells.map((cell, index) => (
+            <td key={index}>{cell === null ? "—" : typeof cell === "boolean" ? (cell ? "是" : "否") : typeof cell === "number" ? String(Number(cell.toFixed(2))) : cell}</td>
+          ))}</tr>
+        ))}</tbody>
+      </table>
+    </div>
+  );
+}
+
 /** Server-owned facts, separate from the ordinary Markdown and its TOC state. */
 export const ReportFactTables = memo(function ReportFactTables({ tables }: { tables: readonly ReportFactTable[] }) {
+  const root = useRef<HTMLElement>(null);
+  useEffect(() => {
+    if (root.current) return bindFactTablePrint(root.current, window);
+  }, []);
+
   return (
-    <section className="personal-report-fact-tables" aria-label="计算数据核对表">
+    <section ref={root} className="personal-report-fact-tables" aria-label="计算数据核对表">
       <h2>计算数据核对表</h2>
       {tables.map((table) => (
         <details key={table.id}>
           <summary>{table.title} · {STATUS_LABELS[table.claimStatus]}</summary>
           <p>{table.note}</p>
-          {table.rows.length > 0 && (
-            <div className="overflow-x-auto" role="region" aria-label={table.title} tabIndex={0}>
-              <table>
-                <caption className="sr-only">{table.title}</caption>
-                <thead><tr>{table.columns.map((column) => <th scope="col" key={column}>{column}</th>)}</tr></thead>
-                <tbody>{table.rows.map((row) => (
-                  <tr key={row.sourcePath}>{row.cells.map((cell, index) => (
-                    <td key={index}>{cell === null ? "—" : typeof cell === "boolean" ? (cell ? "是" : "否") : String(cell)}</td>
-                  ))}</tr>
-                ))}</tbody>
-              </table>
-            </div>
-          )}
+          <FactTable table={table} />
+          {table.subtables?.map((subtable) => (
+            <section key={subtable.id}>
+              <h3>{subtable.title}</h3>
+              {subtable.note && <p>{subtable.note}</p>}
+              <FactTable table={subtable} />
+            </section>
+          ))}
         </details>
       ))}
     </section>