fix: repair print/PDF in Reports — fix document.write/appendChild mix, add printPdfBlob for print format

frontend/src/pages/Reports.tsx

@@ -17,6 +17,7 @@ import {
 } from 'lucide-react';
 import clsx from 'clsx';
 import { PrintButton } from '@/components/common/PrintButton';
+import { printPdfBlob } from '@/utils/print';
 import { useToast } from '@/components/ui/Toast';
 import {
   useReportTemplates,
@@ -163,7 +164,11 @@ export function ReportsPage() {
         output_format: editorFormat,
       });
       const filename = `report_${selectedTemplate.name}.${editorFormat === 'excel' ? 'xlsx' : editorFormat}`;
-      downloadBlob(response.data as Blob, filename);
+      if (editorFormat === 'print') {
+        printPdfBlob(response.data as Blob);
+      } else {
+        downloadBlob(response.data as Blob, filename);
+      }
       setDownloadHistory((prev) => [
         { id: Date.now().toString(), name: selectedTemplate.name, format: editorFormat, timestamp: new Date().toLocaleString() },
         ...prev,
@@ -192,7 +197,11 @@ export function ReportsPage() {
       });
       const ext = activePresetFormat === 'excel' ? 'xlsx' : activePresetFormat === 'print' ? 'pdf' : activePresetFormat;
       const filename = `${preset.key}_report.${ext}`;
-      downloadBlob(response.data as Blob, filename);
+      if (activePresetFormat === 'print') {
+        printPdfBlob(response.data as Blob);
+      } else {
+        downloadBlob(response.data as Blob, filename);
+      }
       setDownloadHistory((prev) => [
         { id: Date.now().toString(), name: preset.name, format: activePresetFormat, timestamp: new Date().toLocaleString() },
         ...prev,