fix: Step 7 路由 + 发送端字符串对齐（消除 KeyError）+ 配套防御性补强

核心修复

- panel_registry: step7_index class_ref 换绑 Step7View（最小侵入式对位，保持 step_id 保护全项目 18 处下游引用）

- step7_view._on_run_single_clicked: 'step7' → 'step7_index'（wrapped_config key + step_name 同步对齐，消除 PipelineScheduler 抛 KeyError "未注册的步骤: 'step7'"）

配套防御性补强

- pipeline_executor.run_single_step_handler: 后台 is_running 时改 QMessageBox 警告 + LogMessage，防多次点击死锁

- worker_thread.run_single_step: 兼容嵌套/扁平 config 格式，嵌套子 dict 为空时回退扁平读取

- 公式 ListWidget layout 修复：setUniformItemSizes + stretch=1 + update()，消除 step7_view 加载后坍塌/不刷新

src/gui/core/panel_registry.py

@@ -18,7 +18,7 @@ from src.gui.panels.step3_panel import Step3Panel
 from src.gui.panels.step4_sampling_panel import Step4SamplingPanel
 from src.gui.panels.step5_clean_panel import Step5CleanPanel
 from src.gui.panels.step6_feature_panel import Step6FeaturePanel
-from src.gui.panels.step7_index_panel import Step7IndexPanel
+from src.new.views.step7_view import Step7View
 from src.gui.panels.step8_ml_train_panel import Step8MlTrainPanel
 from src.gui.panels.step9_ml_predict_panel import Step9MlPredictPanel
 from src.gui.panels.step10_watercolor_panel import Step10WatercolorPanel
@@ -112,7 +112,7 @@ PANEL_REGISTRY = [
     },
     {
         'step_id': 'step7_index',
-        'class_ref': Step7IndexPanel,
+        'class_ref': Step7View,
         'title': '水质光谱指数计算',
         'icon': '7.png',
         'stage': '阶段二：样本数据准备',

src/gui/core/pipeline_executor.py

@@ -409,6 +409,8 @@ class PipelineExecutor(QObject):
             step_name = data.get('step_name')
             config = data.get('config')
 
+            print(f"==== Executor 收到单步请求: {step_name} ====", flush=True)
+
             if not step_name:
                 global_event_bus.publish('LogMessage', {
                     'message': '[单步执行] 请求缺少 step_name，忽略',
@@ -416,6 +418,18 @@ class PipelineExecutor(QObject):
                 })
                 return
 
+            # ★ 防死锁：若已有 Worker 在运行，不静默吞掉，而是通知用户
+            if self.is_running:
+                global_event_bus.publish('LogMessage', {
+                    'message': f'[单步执行] 后台正在运行中，无法启动 {step_name}。请等待当前任务完成或手动停止后再试。',
+                    'level': 'warning',
+                })
+                QMessageBox.warning(
+                    self.parent(), "后台忙碌",
+                    f"后台正在运行中，无法启动 {step_name}。\n\n请等待当前任务完成，或点击「停止」按钮后再试。"
+                )
+                return
+
             global_event_bus.publish('LogMessage', {
                 'message': f'[单步执行] 收到 {step_name} 的执行请求',
                 'level': 'info',

src/gui/core/worker_thread.py

@@ -338,8 +338,18 @@ class WorkerThread(QThread):
                     pass
 
     def run_single_step(self, scheduler, step_name, config):
-        """使用新调度器运行单个步骤。"""
-        step_config = dict(config.get(step_name, {}))
+        """使用新调度器运行单个步骤。
+
+        config 兼容两种格式：
+          嵌套格式：{'step7': {'training_csv_path': ..., ...}}
+          扁平格式：{'training_csv_path': ..., 'formula_names': [...], ...}
+        优先检测嵌套格式；若 step_name 对应的子 dict 为空，则回退到扁平格式。
+        """
+        nested = config.get(step_name)
+        if nested and isinstance(nested, dict) and len(nested) > 0:
+            step_config = dict(nested)
+        else:
+            step_config = dict(config)
 
         # 透传外部预训练模型（非空才覆盖）
         for key in ('_external_model', '_external_model_path',

src/gui/panels/step7_index_panel.py

@@ -123,6 +123,7 @@ class Step7IndexPanel(QWidget):
 
         self.formula_list = QListWidget()
         self.formula_list.setSelectionMode(QAbstractItemView.MultiSelection)
+        self.formula_list.setMinimumHeight(300)
         self.formula_list.itemChanged.connect(self._on_item_changed)
         self.formula_layout.addWidget(self.formula_list)
 

src/new/views/step7_view.py

@@ -129,9 +129,10 @@ class Step7View(BaseView):
         self.formula_list.setSelectionMode(QListWidget.MultiSelection)
         self.formula_list.setMinimumHeight(300)
         self.formula_list.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+        self.formula_list.setUniformItemSizes(True)
         # view 层不需要 itemChanged 副作用；service 接管时再启用
         self.formula_list.blockSignals(True)
-        formula_outer_layout.addWidget(self.formula_list)
+        formula_outer_layout.addWidget(self.formula_list, stretch=1)
 
         self.formula_group.setLayout(formula_outer_layout)
         layout.addWidget(self.formula_group)
@@ -233,6 +234,8 @@ class Step7View(BaseView):
                 self.index_checkboxes[name] = item
             self.formula_list.blockSignals(False)
             self.formula_list.adjustSize()
+            self.formula_list.updateGeometry()
+            self.update()
 
             for btn in (self.select_all_btn, self.deselect_all_btn,
                         self.select_ratio_btn, self.select_conc_btn, self.refresh_button):
@@ -319,6 +322,14 @@ class Step7View(BaseView):
     # 执行入口
     # ------------------------------------------------------------------
     def _on_run_single_clicked(self):
-        from src.gui.core.event_bus import global_event_bus
-        config = self.get_config()
-        global_event_bus.publish('RequestRunSingleStep', {'step_name': 'step7', 'config': config})
+        import traceback
+        print("==== Step 7 计算按钮物理按下 ====", flush=True)
+        try:
+            from src.gui.core.event_bus import global_event_bus
+            config = self.get_config()
+            wrapped_config = {'step7_index': config}
+            global_event_bus.publish('RequestRunSingleStep', {'step_name': 'step7_index', 'config': wrapped_config})
+        except Exception as e:
+            traceback.print_exc()
+            from PyQt5.QtWidgets import QMessageBox
+            QMessageBox.critical(self, "Step7 发射失败", f"收集配置或发送请求时异常:\n\n{e}")