feat(campaign): govern attachment reuse

webui/src/features/campaigns/ReviewSendPage.tsx

@@ -158,6 +158,9 @@ export default function ReviewSendPage({
   );
   const validation = asRecord(version?.validation_summary);
   const build = asRecord(version?.build_summary);
+  const attachmentReuse = asRecord(build.attachment_reuse);
+  const attachmentReusePolicy = asRecord(attachmentReuse.policy);
+  const attachmentReuseFindings = asArray(attachmentReuse.findings).map(asRecord);
   const residualFileDisposition = asRecord(build.residual_file_disposition);
   const residualFileRecipient = asRecord(residualFileDisposition.recipient);
   const printOutput = asRecord(build.print_output);
@@ -1504,6 +1507,29 @@ export default function ReviewSendPage({
                 </DescriptionList>
               </div>
             )}
+            {hasBuild && Object.keys(attachmentReuse).length > 0 && (
+              <div className="review-flow-data-section" data-attachment-reuse-policy>
+                <h3>Attachment reuse policy</h3>
+                <DescriptionList variant="inline">
+                  <div><dt>Action</dt><dd>{humanize(String(attachmentReusePolicy.action ?? "allow"))}</dd></div>
+                  <div><dt>Allowed boundary</dt><dd>{humanize(String(attachmentReusePolicy.allow_within ?? "none"))}</dd></div>
+                  <div><dt>Repeated files</dt><dd>{String(attachmentReuse.duplicate_file_count ?? 0)}</dd></div>
+                  <div><dt>Allowed</dt><dd>{String(attachmentReuse.allowed_file_count ?? 0)}</dd></div>
+                  <div><dt>Policy findings</dt><dd>{String(attachmentReuse.violation_file_count ?? 0)}</dd></div>
+                  <div><dt>Affected messages</dt><dd>{String(attachmentReuse.affected_message_count ?? 0)}</dd></div>
+                </DescriptionList>
+                {attachmentReuseFindings.length > 0 && (
+                  <ul className="small-note">
+                    {attachmentReuseFindings.slice(0, 10).map((finding) => (
+                      <li key={String(finding.file_fingerprint)}>
+                        {String(finding.file_name ?? "Attachment")} · {String(finding.use_count ?? 0)} uses · {humanize(String(finding.disposition ?? "allowed"))}
+                      </li>
+                    ))}
+                  </ul>
+                )}
+                {attachmentReuseFindings.length > 10 && <p className="muted small-note">Showing 10 of {attachmentReuseFindings.length} repeated files.</p>}
+              </div>
+            )}
             {getText(printOutput, "render_id") && (
               <div className="review-flow-data-section">
                 <div className="page-heading split">