自由标记体验重做 + 全部实验性面板可折起

- 网格内固定点：取值胶囊按已放置矩形做纵向避让（不再互相遮挡）；行尾 ✕ 改为与
  胶囊同高的正方形；移除固定点的纵向半透明竖线
- 新增「标记透明度」（0–100%），作用于本网格全部固定点的圆点/胶囊/描边/文字/✕；
  半透明时文字改走 GDI+（GDI DrawTextW 忽略 alpha），100% 时像素零变化；
  ≤2% 时不绘制且不登记 ✕ 命中矩形（看不见的按钮不可点）
- 面板按信号分组：信号色托底分组栏（展开三角 + 信号名 + N 标记点 + ✕，文字/三角/✕
  一律用自适应对比色），点击分组栏收起/展开；条目五列（值/枚举/增量/时刻/间隔），
  首项增列与 Δt 显示 N/A，整个面板没有枚举文本时枚举列整列缺省；行尾仍有 ✕
- 面板内容超高时右侧出现滚动条（分组栏与条目一起滚动），滚轮在内容区翻页；
  底部按钮与「标记透明度」滑块固定在底部、不参与滚动
- 底部按钮改为「光标选取模式」切换类按钮（外观与工具栏切换按钮一致，激活高亮），
  激活时其上方出现「标记透明度」滑动条（与信号样式区的透明度滑块同款）
- 所有实验性功能浮动面板支持展开/折起：标题栏 GX 徽标左侧新增「三角 + 横线」指示器，
  单击切换、双击标题栏切换；折起的面板只有标题栏
- 数据层：LanePanelState.collapsed、Lane.freeMarkerOpacity/freeMarkerScroll/
  freeMarkerCollapsedGroups，LaneCarry 与 SplitLane 一并继承
- 验证：新增离屏 .preflight/perf/mark2check 69/69（含两组 A/B）；回归 datacheck 69/69、
  verify 49/49、panelanim 158/158、errcheck 19/19；make release/debug 零警告

Utilities/Src/DataModelInternal.hpp

@@ -92,6 +92,9 @@ namespace jdi
 				bool freeMarkerCursor = false;
 				std::vector<Lane::FreeMarkerItem> freeMarkerItems;
 				LanePanelState freeMarkerPanel;
+				float freeMarkerOpacity = 1.0f;
+				float freeMarkerScroll = 0.0f;
+				std::vector<SignalRef> freeMarkerCollapsedGroups;
 			};
 
 			// 先记下每个信号原来所在网格的网格自身状态：
@@ -133,6 +136,9 @@ namespace jdi
 				carry.freeMarkerCursor = lane.freeMarkerCursor;
 				carry.freeMarkerItems = lane.freeMarkerItems;
 				carry.freeMarkerPanel = lane.freeMarkerPanel;
+				carry.freeMarkerOpacity = lane.freeMarkerOpacity;
+				carry.freeMarkerScroll = lane.freeMarkerScroll;
+				carry.freeMarkerCollapsedGroups = lane.freeMarkerCollapsedGroups;
 				for (const SignalRef& ref : lane.signals)
 				{
 					previousCarry.emplace_back(ref, carry);
@@ -158,29 +164,37 @@ namespace jdi
 				lane.edgeValue = carry.edgeValue;
 				lane.edgeValueValid = carry.edgeValueValid;
 				lane.edgePanel.open = carry.edgePanel.open;
+				lane.edgePanel.collapsed = carry.edgePanel.collapsed;
 				lane.edgePanel.x = carry.edgePanel.x;
 				lane.edgePanel.y = carry.edgePanel.y;
 				lane.edgeCenter = carry.edgeCenter;
 				lane.edgeCenterItems = carry.edgeCenterItems;
 				lane.edgeCenterPanel.open = carry.edgeCenterPanel.open;
+				lane.edgeCenterPanel.collapsed = carry.edgeCenterPanel.collapsed;
 				lane.edgeCenterPanel.x = carry.edgeCenterPanel.x;
 				lane.edgeCenterPanel.y = carry.edgeCenterPanel.y;
 				lane.meanFilter = carry.meanFilter;
 				lane.meanFilterItems = carry.meanFilterItems;
 				lane.meanFilterPanel.open = carry.meanFilterPanel.open;
+				lane.meanFilterPanel.collapsed = carry.meanFilterPanel.collapsed;
 				lane.meanFilterPanel.x = carry.meanFilterPanel.x;
 				lane.meanFilterPanel.y = carry.meanFilterPanel.y;
 				lane.weakPeak = carry.weakPeak;
 				lane.weakPeakItems = carry.weakPeakItems;
 				lane.weakPeakPanel.open = carry.weakPeakPanel.open;
+				lane.weakPeakPanel.collapsed = carry.weakPeakPanel.collapsed;
 				lane.weakPeakPanel.x = carry.weakPeakPanel.x;
 				lane.weakPeakPanel.y = carry.weakPeakPanel.y;
 				lane.freeMarker = carry.freeMarker;
 				lane.freeMarkerCursor = carry.freeMarkerCursor;
 				lane.freeMarkerItems = carry.freeMarkerItems;
 				lane.freeMarkerPanel.open = carry.freeMarkerPanel.open;
+				lane.freeMarkerPanel.collapsed = carry.freeMarkerPanel.collapsed;
 				lane.freeMarkerPanel.x = carry.freeMarkerPanel.x;
 				lane.freeMarkerPanel.y = carry.freeMarkerPanel.y;
+				lane.freeMarkerOpacity = carry.freeMarkerOpacity;
+				lane.freeMarkerScroll = carry.freeMarkerScroll;
+				lane.freeMarkerCollapsedGroups = carry.freeMarkerCollapsedGroups;
 			};
 
 			// 收集全部可见信号引用。