fix: QTextEdit → QTextBrowser (setMaximumBlockCount 兼容性)

QTextEdit 没有 setMaximumBlockCount 方法 (Windows 上报 AttributeError),
QTextBrowser 继承 QTextEdit 且支持该方法, 无其他副作用。

DLD154Tool/main.py

@@ -19,7 +19,7 @@ from PySide6.QtCore import Qt, QTimer, Signal, Slot, QThread
 from PySide6.QtWidgets import (
     QApplication, QMainWindow, QWidget, QTabWidget,
     QVBoxLayout, QHBoxLayout, QFormLayout, QGroupBox,
-    QLabel, QLineEdit, QComboBox, QPushButton, QTextEdit,
+    QLabel, QLineEdit, QComboBox, QPushButton, QTextBrowser,
     QSpinBox, QCheckBox, QSplitter, QGridLayout, QMessageBox,
 )
 
@@ -274,7 +274,7 @@ class Tab700BS(QWidget):
         # 结果显示
         gb_disp = QGroupBox("响应")
         vl = QVBoxLayout(gb_disp)
-        self._txt_disp = QTextEdit()
+        self._txt_disp = QTextBrowser()
         self._txt_disp.setReadOnly(True)
         self._txt_disp.setMaximumBlockCount(200)
         vl.addWidget(self._txt_disp)
@@ -414,7 +414,7 @@ class TabModbus(QWidget):
         # ── 响应 / 全数据显示 ──
         gb_disp = QGroupBox("响应 & 全数据")
         vl = QVBoxLayout(gb_disp)
-        self._txt_modbus = QTextEdit()
+        self._txt_modbus = QTextBrowser()
         self._txt_modbus.setReadOnly(True)
         self._txt_modbus.setMaximumBlockCount(500)
         self._txt_modbus.setFontFamily("monospace")
@@ -515,7 +515,7 @@ class LogTab(QWidget):
     def __init__(self):
         super().__init__()
         layout = QVBoxLayout(self)
-        self._txt_log = QTextEdit()
+        self._txt_log = QTextBrowser()
         self._txt_log.setReadOnly(True)
         self._txt_log.setMaximumBlockCount(1000)
         self._txt_log.setFontFamily("monospace")