fix(client): 标签字体细化：阈值 128，店名细体

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

CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.51] - 2026-06-15
+
+### 改进
+- 标签打印字体细化：阈值调回 128，店名改细体，商品名保持粗体
+
 ## [1.0.50] - 2026-06-15
 
 ### 改进

client/lib/core/utils/print_util_stub.dart

@@ -240,8 +240,8 @@ Future<ui.Image> _renderLabelBitmap({
 
   final codeText = code.isNotEmpty ? '编号：$code' : '';
   final rows = <(String, double, bool)>[
-    if (shop.isNotEmpty)     (shop,    kShopSize,  true),
-    if (name.isNotEmpty)     (name,    nameSize,   true),
+    if (shop.isNotEmpty)     (shop,    kShopSize,  false), // 店名细体，突出商品名
+    if (name.isNotEmpty)     (name,    nameSize,   true),  // 商品名粗体
     if (codeText.isNotEmpty) (codeText, kSmallSize, false),
     if (degSpec.isNotEmpty)  (degSpec,  kSmallSize, false),
     if (date.isNotEmpty)     (date,     kSmallSize, false),
@@ -311,7 +311,7 @@ Future<bool> _printFlatLabelThermal({
               : 0.299 * rgba[i] + 0.587 * rgba[i + 1] + 0.114 * rgba[i + 2];
         }
       }
-      if (lum / 4 < 160) row[xx >> 3] &= ~(0x80 >> (xx & 7)); // 黑点 -> bit0
+      if (lum / 4 < 128) row[xx >> 3] &= ~(0x80 >> (xx & 7)); // 黑点 -> bit0
     }
     out.add(row);
   }