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/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}")