feat(confidence-engine): v0.60h migrate report route to use route [id] identity

app/investigations/[id]/report/page.jsx

@@ -4,7 +4,8 @@ import React, { useEffect, useRef, useState } from "react";
 import { loadInvestigation, saveInvestigation } from "@/lib/storage/investigation-storage";
 import Link from "next/link";
 
-export default function ReportPage() {
+export default function ReportPage({ params }) {
+  const routeId = (typeof params === "object" && params?.id != null) ? String(params.id) : "";
   const [existing, setExisting] = useState(null);
   const [hydrated, setHydrated] = useState(false);
   const [generationLoading, setGenerationLoading] = useState(false);
@@ -14,7 +15,7 @@ export default function ReportPage() {
   const generationAttempted = useRef(false);
 
   useEffect(() => {
-    setExisting(loadInvestigation());
+    setExisting(loadInvestigation(routeId));
     setHydrated(true);
   }, []);
 
@@ -72,7 +73,7 @@ export default function ReportPage() {
     if (updateLoading) return;
     setUpdateLoading(true);
 
-    const snap = loadInvestigation();
+    const snap = loadInvestigation(routeId);
     const situationGraph = snap?.situationGraph;
     const findings = snap?.findings ?? [];
     const rev = snap?.investigationRevision ?? 0;
@@ -213,7 +214,7 @@ export default function ReportPage() {
       {/* Back to investigation */}
       <div className="mt-10">
         <Link
-          href="/investigations/case-1"
+          href={`/investigations/${routeId}`}
           className="rounded-lg border border-teal-600 bg-white px-4 py-2 text-sm font-medium text-teal-700 hover:bg-teal-50 transition"
         >
           Back to investigation