界面优化

src/gui/panels/step5_panel.py

@@ -191,6 +191,15 @@ class Step5Panel(QWidget):
         else:
             self.output_file.set_path("")
 
+        # 5. 尝试从 Step4 界面读取已处理的水质参数 CSV 路径，自动填入本面板
+        main_window = self.window()
+        if main_window and hasattr(main_window, 'step4_panel'):
+            step4_output_path = main_window.step4_panel.output_file.get_path()
+            if step4_output_path:
+                existing_csv = self.csv_file.get_path()
+                if not existing_csv or not existing_csv.strip():
+                    self.csv_file.set_path(step4_output_path)
+
     def run_step(self):
         """独立运行步骤5"""
         # 验证输入