fix: 导航状态锁防抖 + 运行按钮中间槽函数（修复乱跳与无响应双 Bug）

Bug1 导航乱跳：_on_step_list_changed 先调 get_panel 触发懒加载再 setCurrentIndex，避免 removeTab/insertTab 索引偏移导致跳页错乱。_on_tab_changed 加 _is_syncing 守卫斩断乒乓效应。Bug2 按钮无响应：新增 _on_run_all_clicked 中间槽函数替代直接连接，内含 print 探针 + try/except 兜底。

src/gui/water_quality_gui_v2.py

@@ -88,6 +88,8 @@ class WaterQualityGUI(QMainWindow):
         ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(my_appid)
         super().__init__()
 
+        self._is_syncing = False
+
         icon_path = get_resource_path("data/icons-1/uitubiao.ico")
         self.setWindowIcon(QIcon(icon_path))
 
@@ -358,7 +360,7 @@ class WaterQualityGUI(QMainWindow):
         self._run_all_btn = QPushButton("> 运行完整流程")
         self._run_all_btn.setStyleSheet(ModernStylesheet.get_button_stylesheet('success'))
         self._run_all_btn.setMinimumHeight(35)
-        self._run_all_btn.clicked.connect(self._pipeline_executor.run_full_pipeline)
+        self._run_all_btn.clicked.connect(self._on_run_all_clicked)
         btn_layout.addWidget(self._run_all_btn)
 
         self._stop_btn = QPushButton("⏹ 停止")
@@ -417,11 +419,21 @@ class WaterQualityGUI(QMainWindow):
         work_dir = data.get('work_dir', '')
         self.statusBar().showMessage(f"工作目录: {work_dir}")
 
+    def _on_run_all_clicked(self):
+        print("==== 按钮确实被按下了 ====", flush=True)
+        try:
+            self._pipeline_executor.run_full_pipeline()
+        except Exception as e:
+            print(f"执行器调用崩溃: {e}")
+            traceback.print_exc()
+
     # ================================================================
     # 导航 ↔ Tab 双向同步（纯 UI 路由）
     # ================================================================
 
     def _on_step_list_changed(self, index):
+        if self._is_syncing:
+            return
         if index < 0:
             return
         item = self._step_list.item(index)
@@ -432,10 +444,21 @@ class WaterQualityGUI(QMainWindow):
             return
         from src.gui.core.panel_registry import get_tab_index
         tab_index = get_tab_index(item_data)
-        if tab_index >= 0:
+        if tab_index < 0:
+            return
+        self._is_syncing = True
+        try:
+            # ★ 先触发懒加载：get_panel 内部 _ensure_loaded 自带 blockSignals
+            #    保护 removeTab/insertTab，面板实例化完成后再切 Tab，
+            #    此时 _ensure_loaded 发现已加载直接返回，不再触发索引偏移
+            self._panel_factory.get_panel(item_data)
             self._tab_widget.setCurrentIndex(tab_index)
+        finally:
+            self._is_syncing = False
 
     def _on_tab_changed(self, index):
+        if self._is_syncing:
+            return
         if index < 0:
             return
         from src.gui.core.panel_registry import get_step_id_by_tab_index
@@ -447,7 +470,11 @@ class WaterQualityGUI(QMainWindow):
             if not item:
                 continue
             if item.data(Qt.UserRole) == target_step_id:
-                self._step_list.setCurrentRow(row)
+                self._is_syncing = True
+                try:
+                    self._step_list.setCurrentRow(row)
+                finally:
+                    self._is_syncing = False
                 break
 
     # ================================================================