fix: 改进截图逻辑，直接截取表格元素

尝试截取table.ltable元素来获取完整内容，而不是依赖full_page参数。

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

playwright_automation.py

@@ -1361,10 +1361,29 @@ class PlaywrightAutomation:
             # 先保存到临时文件
             temp_filepath = filepath + '.tmp'
 
-            # 获取iframe并截取完整内容
+            # 获取iframe
             iframe = self.get_iframe_safe()
             if iframe:
-                # 对iframe内容进行全页截图
+                # 尝试截取iframe内的主要内容区域
+                try:
+                    # 查找内容表格
+                    table_locator = iframe.locator("table.ltable")
+                    if table_locator.count() > 0:
+                        table_locator.first.screenshot(
+                            path=temp_filepath,
+                            type='jpeg',
+                            quality=100
+                        )
+                    else:
+                        # 如果没有表格，截取整个body内容
+                        iframe.locator("body").screenshot(
+                            path=temp_filepath,
+                            type='jpeg',
+                            quality=100
+                        )
+                except Exception as e:
+                    self.log(f"元素截图失败: {e}，尝试全页截图")
+                    # 回退到iframe全页截图
                     iframe.screenshot(
                         path=temp_filepath,
                         type='jpeg',