fix(confidence-engine): preserve investigation activity across turns

ThreadContributionsBadge, PriorContributionsSummary, and
SecondaryPreviousLearning all filtered contributions via
c.targetNodeId === nodeId. Multi-turn follow-up Contributions carry a
different immediate targetNodeId while the canonical origin remains on
Findings (originatingTargetNodeId).

Repaired: all contribution filters now match on EITHER
c.targetNodeId === nodeId || c.originatingTargetNodeId === nodeId.
handleDeconstructSubmit carries originatingTargetNodeId from
focusedPresentationItemId as provenance for cold-return recovery.

components/reasoning-workspace.jsx

@@ -471,7 +471,9 @@ function EvidenceLimitCard({ summary }) {
 // ── Prior contribution summary (embedded within FocusedQuestionBody) ───
 
 function PriorContributionsSummary({ nodeId, contributions }) {
-  const threadContribs = contributions.filter((c) => c.targetNodeId === nodeId);
+  const threadContribs = (contributions || []).filter(
+    (c) => c.targetNodeId === nodeId || c.originatingTargetNodeId === nodeId,
+  );
   if (!threadContribs.length) return null;
 
   // Exclude the most recent contribution — it is already shown as the current result above.
@@ -519,7 +521,9 @@ function PriorContributionsSummary({ nodeId, contributions }) {
 // ── Standalone previous learning block (for two-column secondary placement) ───
 
 function SecondaryPreviousLearning({ nodeId, contributions }) {
-  const threadContribs = contributions.filter((c) => c.targetNodeId === nodeId);
+  const threadContribs = (contributions || []).filter(
+    (c) => c.targetNodeId === nodeId || c.originatingTargetNodeId === nodeId,
+  );
   if (!threadContribs.length) return null;
 
   // Exclude the most recent contribution — it is already shown as the current result above.
@@ -567,7 +571,9 @@ function SecondaryPreviousLearning({ nodeId, contributions }) {
 // ── Thread contributions badge (standalone — used outside focused body) ───
 
 function ThreadContributionsBadge({ nodeId, contributions }) {
-  const threadContribs = contributions.filter((c) => c.targetNodeId === nodeId);
+  const threadContribs = (contributions || []).filter(
+    (c) => c.targetNodeId === nodeId || c.originatingTargetNodeId === nodeId,
+  );
   if (!threadContribs.length) return null;
 
   // Show most recent contribution summary inline
@@ -1401,7 +1407,7 @@ export default function ReasoningWorkspace({
     if (!target) return;
 
     const priorContribs = (focusedContributions || []).filter(
-      (c) => c.targetNodeId === target,
+      (c) => c.targetNodeId === target || c.originatingTargetNodeId === target,
     );
 
     setFocusedPresentationItemId(target);
@@ -1511,6 +1517,7 @@ export default function ReasoningWorkspace({
       // Persist contribution to case-level owner (ScenarioForm)
       onFocusedContribution?.({
         targetNodeId,
+        originatingTargetNodeId: focusedPresentationItemId,
         targetLabel: targetNode?.label || "",
         targetDescription: targetNode?.description || "",
         question: focused.question,