fix(client): 统一打印错误处理，失败时上报并弹提示

新增 safePrint 封装，所有打印调用点统一 catch 任意异常（含字体加载失败），
自动上报 error_reporter 并展示 SnackBar，不再静默失败。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/lib/core/utils/print_util.dart

@@ -1,6 +1,8 @@
 import 'dart:typed_data';
+import 'package:flutter/material.dart';
 import '../../models/stock_in.dart';
 import '../../models/stock_out.dart';
+import '../errors/error_reporter.dart';
 import 'print_util_stub.dart'
     if (dart.library.js_interop) 'print_util_web.dart';
 
@@ -36,3 +38,18 @@ Future<void> printStockInOrder(StockInOrder order) =>
 
 Future<void> printStockOutOrder(StockOutOrder order) =>
     printStockOutOrderImpl(order);
+
+/// 统一打印入口：catch 任意异常，上报并弹 SnackBar 给用户。
+/// 用法：await safePrint(context, () => printStockInOrder(order));
+Future<void> safePrint(BuildContext context, Future<void> Function() fn) async {
+  try {
+    await fn();
+  } catch (e, st) {
+    reportError(e, st);
+    if (context.mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('打印失败：$e'), backgroundColor: Colors.red),
+      );
+    }
+  }
+}

client/lib/core/utils/print_util_stub.dart

@@ -190,7 +190,6 @@ Future<void> printProductLabelImpl({
     ),
   ));
 
-  try {
     await Printing.layoutPdf(onLayout: (_) async => doc.save());
   } catch (e, st) {
     reportError(e, st);
@@ -430,7 +429,6 @@ Future<void> printStockInOrderImpl(StockInOrder order) async {
       ),
     ],
   ));
-  try {
     await Printing.layoutPdf(onLayout: (_) async => doc.save());
   } catch (e, st) {
     reportError(e, st);

client/lib/screens/inventory/inventory_list_screen.dart

@@ -485,12 +485,12 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                                   item.productId != null
                                       ? TextButton(
                                           onPressed: () async {
-                                            try {
-                                              final qrBytes = await ref
-                                                  .read(productRepositoryProvider)
-                                                  .getQRCodeBytes(item.productId!);
-                                              final shopInfo = ref.read(shopInfoProvider).valueOrNull;
-                                              await printProductLabel(
+                                            final qrBytes = await ref
+                                                .read(productRepositoryProvider)
+                                                .getQRCodeBytes(item.productId!);
+                                            final shopInfo = ref.read(shopInfoProvider).valueOrNull;
+                                            if (context.mounted) {
+                                              await safePrint(context, () => printProductLabel(
                                                 qrBytes: qrBytes,
                                                 name: item.productName,
                                                 code: item.productCode,
@@ -502,14 +502,7 @@ class _InventoryListScreenState extends ConsumerState<InventoryListScreen> {
                                                 shopName: shopInfo?.name ?? '',
                                                 shopAddress: shopInfo?.address ?? '',
                                                 shopPhone: shopInfo?.phone ?? '',
-                                              );
-                                            } catch (e) {
-                                              if (context.mounted) {
-                                                ScaffoldMessenger.of(context).showSnackBar(
-                                                  SnackBar(content: Text('打印失败：$e'),
-                                                      backgroundColor: AppTheme.danger),
-                                                );
-                                              }
+                                              ));
                                             }
                                           },
                                           child: const Text('打标签',

client/lib/screens/products/product_detail_screen.dart

@@ -528,10 +528,10 @@ class _QRCodeDialogState extends ConsumerState<_QRCodeDialog> {
   Future<void> _print() async {
     if (_bytes == null || _printing) return;
     setState(() { _printing = true; _printStatus = '正在打印...'; });
+    final p = widget.product;
+    final shopInfo = ref.read(shopInfoProvider).valueOrNull;
     try {
-      final p = widget.product;
-      final shopInfo = ref.read(shopInfoProvider).valueOrNull;
-      await printProductLabel(
+      await safePrint(context, () => printProductLabel(
         qrBytes: _bytes!,
         name: p.name,
         code: p.code,
@@ -540,13 +540,7 @@ class _QRCodeDialogState extends ConsumerState<_QRCodeDialog> {
         shopName: shopInfo?.name ?? '',
         shopAddress: shopInfo?.address ?? '',
         shopPhone: shopInfo?.phone ?? '',
-      );
-    } catch (e) {
-      if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('打印失败：$e'), backgroundColor: Colors.red),
-        );
-      }
+      ));
     } finally {
       if (mounted) setState(() { _printing = false; _printStatus = ''; });
     }

client/lib/screens/stock_in/stock_in_form_screen.dart

@@ -137,7 +137,7 @@ class _StockInFormScreenState extends ConsumerState<StockInFormScreen> {
 
   Future<void> _printOrder() async {
     if (_loadedOrder == null) return;
-    await printStockInOrder(_loadedOrder!);
+    await safePrint(context, () => printStockInOrder(_loadedOrder!));
   }
 
   Future<void> _submit(bool asDraft) async {

client/lib/screens/stock_in/stock_in_list_screen.dart

@@ -1,4 +1,6 @@
 import '../../core/utils/dialog_util.dart';
+import '../../core/errors/error_reporter.dart';
+import '../../core/utils/print_util.dart' show safePrint, printStockInOrder, printProductLabel;
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
@@ -247,15 +249,9 @@ class _StockInListScreenState extends ConsumerState<StockInListScreen> {
               ),
               TextButton(
                 onPressed: () async {
-                  try {
-                    final order = await ref.read(stockInRepositoryProvider).get(o.id);
-                    await printStockInOrder(order);
-                  } catch (e) {
-                    if (context.mounted) {
-                      ScaffoldMessenger.of(context).showSnackBar(
-                        SnackBar(content: Text(e.toString()), backgroundColor: Colors.red),
-                      );
-                    }
+                  final order = await ref.read(stockInRepositoryProvider).get(o.id);
+                  if (context.mounted) {
+                    await safePrint(context, () => printStockInOrder(order));
                   }
                 },
                 child: const Text('打印',
@@ -698,17 +694,7 @@ class _StockInDetailDialogState extends ConsumerState<_StockInDetailDialog> {
                     IconButton(
                       icon: const Icon(Icons.print_outlined, color: Colors.white),
                       tooltip: '打印',
-                      onPressed: () async {
-                        try {
-                          await printStockInOrder(_loadedOrder!);
-                        } catch (e) {
-                          if (context.mounted) {
-                            ScaffoldMessenger.of(context).showSnackBar(
-                              SnackBar(content: Text(e.toString()), backgroundColor: Colors.red),
-                            );
-                          }
-                        }
-                      },
+                      onPressed: () => safePrint(context, () => printStockInOrder(_loadedOrder!)),
                     ),
                   IconButton(
                     icon: const Icon(Icons.close, color: Colors.white),
@@ -966,7 +952,8 @@ class _LabelPrintDialogState extends State<_LabelPrintDialog> {
         );
         done++;
         if (mounted) setState(() => _status = '已打印 $done 张...');
-      } catch (e) {
+      } catch (e, st) {
+        reportError(e, st);
         if (mounted) setState(() => _status = '第${i + 1}行打印失败：$e');
       }
     }

client/lib/screens/stock_out/stock_out_form_screen.dart

@@ -222,7 +222,7 @@ class _StockOutFormScreenState extends ConsumerState<StockOutFormScreen> {
 
   Future<void> _printOrder() async {
     if (_loadedOrder == null) return;
-    await printStockOutOrder(_loadedOrder!);
+    await safePrint(context, () => printStockOutOrder(_loadedOrder!));
   }
 
   Future<void> _submit(bool asDraft) async {

client/lib/screens/stock_out/stock_out_list_screen.dart

@@ -1,5 +1,7 @@
 import '../../repositories/product_repository.dart';
 import '../../core/utils/dialog_util.dart';
+import '../../core/errors/error_reporter.dart';
+import '../../core/utils/print_util.dart' show safePrint, printStockOutOrder, printProductLabel;
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
@@ -254,15 +256,9 @@ class _StockOutListScreenState extends ConsumerState<StockOutListScreen> {
               ),
               TextButton(
                 onPressed: () async {
-                  try {
-                    final order = await ref.read(stockOutRepositoryProvider).get(o.id);
-                    await printStockOutOrder(order);
-                  } catch (e) {
-                    if (context.mounted) {
-                      ScaffoldMessenger.of(context).showSnackBar(
-                        SnackBar(content: Text(e.toString()), backgroundColor: Colors.red),
-                      );
-                    }
+                  final order = await ref.read(stockOutRepositoryProvider).get(o.id);
+                  if (context.mounted) {
+                    await safePrint(context, () => printStockOutOrder(order));
                   }
                 },
                 child: const Text('打印',
@@ -690,17 +686,7 @@ class _StockOutDetailDialogState extends ConsumerState<_StockOutDetailDialog> {
                     IconButton(
                       icon: const Icon(Icons.print_outlined, color: Colors.white),
                       tooltip: '打印',
-                      onPressed: () async {
-                        try {
-                          await printStockOutOrder(_loadedOrder!);
-                        } catch (e) {
-                          if (context.mounted) {
-                            ScaffoldMessenger.of(context).showSnackBar(
-                              SnackBar(content: Text(e.toString()), backgroundColor: Colors.red),
-                            );
-                          }
-                        }
-                      },
+                      onPressed: () => safePrint(context, () => printStockOutOrder(_loadedOrder!)),
                     ),
                   IconButton(
                     icon: const Icon(Icons.close, color: Colors.white),
@@ -960,10 +946,9 @@ class _LabelPrintDialogState extends State<_LabelPrintDialog> {
         );
         done++;
         if (mounted) setState(() => _status = '已打印 $done 张...');
-      } catch (e) {
-        if (mounted) {
-          setState(() => _status = '第${i + 1}行打印失败：$e');
-        }
+      } catch (e, st) {
+        reportError(e, st);
+        if (mounted) setState(() => _status = '第${i + 1}行打印失败：$e');
       }
     }
     if (mounted) {