feat(confidence-engine): v0.60j preserve investigation on restart

components/scenario-form.jsx

@@ -6,7 +6,7 @@ import DiagnosticsView from "@/components/diagnostics-view";
 import ReasoningWorkspace, { LoadingOverlay, ContinueLaterBanner } from "@/components/reasoning-workspace";
 import { mockFetch, AVAILABLE_SCENARIOS } from "@/lib/mocks/confidence-engine/mock-client";
 import { deriveFindingsFromContributions, normalizeFindings } from "@/lib/graph/finding-helpers";
-import { loadInvestigation, saveInvestigation, clearInvestigation } from "@/lib/storage/investigation-storage";
+import { loadInvestigation, saveInvestigation, restartInvestigation, clearInvestigation } from "@/lib/storage/investigation-storage";
 
 /* Compile-time env resolution — NEXT_PUBLIC_ vars are injected by Next.js at build */
 const MOCK_ENABLED = process.env.NEXT_PUBLIC_CONFIDENCE_ENGINE_MOCKS === "true";
@@ -947,7 +947,7 @@ export default function ScenarioForm({ investigationId, onNavigateToReport }) {
                   setResult((prev) => ({ ...(prev ?? {}), situationGraph: nextGraph }));
                 }}
                 onRestart={() => {
-                  clearInvestigation();
+                  restartInvestigation(investigationId);
                   setInvestigationRevision(0);
                   setStatus("idle");
                   setResult(null);
@@ -968,7 +968,7 @@ export default function ScenarioForm({ investigationId, onNavigateToReport }) {
 
       {/* ── Continue later banner when session was restored ── */}
       {status === "success" && result?.updatedAt && (
-        <ContinueLaterBanner onRestart={() => { clearInvestigation(); setInvestigationRevision(0); setStatus("idle"); setResult(null); setAnswer(""); setUpdateStatus("idle"); setCurrentUnderstanding(null); setFocusedContributions([]); setFindings([]); }} />
+        <ContinueLaterBanner onRestart={() => { restartInvestigation(investigationId); setInvestigationRevision(0); setStatus("idle"); setResult(null); setAnswer(""); setUpdateStatus("idle"); setCurrentUnderstanding(null); setFocusedContributions([]); setFindings([]); }} />
       )}
 
       {/* Reset button after successful analysis */}
@@ -976,7 +976,7 @@ export default function ScenarioForm({ investigationId, onNavigateToReport }) {
         <div className="text-center">
           <button
             onClick={() => {
-              clearInvestigation();
+              restartInvestigation(investigationId);
               setInvestigationRevision(0);
               setScenario("");
               setStatus("idle");