feat(export): add single PDF export for sections and events with chapter ordering

apps/web/app/components/DocActions.tsx

@@ -75,6 +75,18 @@ export default function DocActions({ slug, body, canEdit }: DocActionsProps) {
         )}
       </button>
 
+      {/* Export PDF */}
+      <Link
+        href={`/export/pdf?path=${slug}`}
+        title="Export document or parent folder to PDF"
+        className="inline-flex items-center gap-1 px-2.5 py-1 text-xs bg-[var(--bg-surface)] hover:bg-[var(--bg-elevated)] border border-[var(--border-color)] hover:border-[var(--brand)] text-[var(--text-muted)] hover:text-[var(--text-primary)] rounded-md transition-all shadow-sm"
+      >
+        <svg className="w-3.5 h-3.5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 17h2a2 2 0 002-2v-4a2 2 0 00-2-2H5a2 2 0 00-2 2v4a2 2 0 002 2h2m2 4h6a2 2 0 002-2v-4a2 2 0 00-2-2H9a2 2 0 00-2 2v4a2 2 0 002 2zm8-12V5a2 2 0 00-2-2H9a2 2 0 00-2 2v4h10z" />
+        </svg>
+        <span>PDF</span>
+      </Link>
+
       {/* Edit Link */}
       <Link
         href={canEdit ? `/${slug}?edit=1` : `/login?redirect=/${slug}`}