feat(配置对话框): 添加Playwright目录浏览功能

在配置对话框中新增Playwright目录选择功能，允许用户手动指定浏览器路径

main_window.py

@@ -4,7 +4,7 @@ PySide6 GUI界面模块
 from PySide6.QtWidgets import (QWidget, QVBoxLayout, QHBoxLayout, QLabel,
                                 QPushButton, QSlider, QDialog, QFormLayout,
                                 QLineEdit, QSpinBox, QMessageBox, QSystemTrayIcon,
-                                QMenu, QTextEdit, QGroupBox, QDialogButtonBox, QCheckBox, QScrollArea)
+                                QMenu, QTextEdit, QGroupBox, QDialogButtonBox, QCheckBox, QScrollArea, QFileDialog)
 from PySide6.QtCore import Qt, QTimer, Signal, QPoint
 from PySide6.QtGui import QFont, QColor, QPainter, QBrush, QPen, QIcon, QAction, QPixmap
 from typing import Callable, Optional
@@ -153,6 +153,16 @@ class ConfigDialog(QDialog):
         layout.addRow("User Agent:", self.user_agent_edit)
         layout.addRow("刷新间隔(s):", self.interval_spin)
 
+        # Playwright目录配置
+        playwright_dir_layout = QHBoxLayout()
+        self.playwright_dir_edit = QLineEdit(spider_config.get('playwright_dir', ''))
+        self.playwright_dir_edit.setPlaceholderText("留空则自动查找Playwright浏览器")
+        self.playwright_browse_btn = QPushButton("浏览...")
+        self.playwright_browse_btn.clicked.connect(self._browse_playwright_dir)
+        playwright_dir_layout.addWidget(self.playwright_dir_edit)
+        playwright_dir_layout.addWidget(self.playwright_browse_btn)
+        layout.addRow("Playwright目录:", playwright_dir_layout)
+
         # UI 配置
         ui_config = self.config_manager.ui_config
 
@@ -186,6 +196,17 @@ class ConfigDialog(QDialog):
         button_box.rejected.connect(self.reject)
         layout.addRow(button_box)
 
+    def _browse_playwright_dir(self):
+        """浏览Playwright目录"""
+        directory = QFileDialog.getExistingDirectory(
+            self,
+            "选择Playwright浏览器目录",
+            "",
+            QFileDialog.ShowDirsOnly | QFileDialog.DontResolveSymlinks
+        )
+        if directory:
+            self.playwright_dir_edit.setText(directory)
+
     def _save_config(self):
         """保存配置"""
         # LLM API
@@ -201,7 +222,8 @@ class ConfigDialog(QDialog):
             target_url=self.url_edit.text(),
             xpath=self.xpath_edit.text(),
             user_agent=self.user_agent_edit.text(),
-            fetch_interval=self.interval_spin.value()
+            fetch_interval=self.interval_spin.value(),
+            playwright_dir=self.playwright_dir_edit.text()
         )
 
         # UI