fix: preserve SCADA comparison device coverage

src/features/workbench/components/investigation-chart-group.tsx

@@ -34,6 +34,14 @@ export function InvestigationChartGroup({ group, reviewing, onCloseChart, refere
   const selected = group.items.find((item) => item.command.chart_id === selectedId) ?? group.items[0];
   const multiple = group.items.length > 1;
   const title = formatChartDisplayText(multiple ? group.title : selected.command.chart.title);
+  const gaps = selected.command.chart.scada?.gaps ?? [];
+  const missingCurrent = gaps.filter((gap) => gap.day_offset === 0 && gap.reason !== "no_scheduled_samples").reduce((sum, gap) => sum + gap.missing_count, 0);
+  const missingHistory = gaps.filter((gap) => gap.day_offset > 0 && gap.reason !== "no_scheduled_samples").reduce((sum, gap) => sum + gap.missing_count, 0);
+  const gapNotice = gaps.length ? <p role="status" aria-label="监测数据缺口" className="shrink-0 text-xs text-muted-foreground">
+    {[missingCurrent ? `当前缺测 ${missingCurrent} 点` : "", missingHistory ? `历史缺测 ${missingHistory} 点` : "",
+      gaps.some((gap) => gap.reason.startsWith("outside_frozen_")) ? "部分数据不在冻结范围内" : "",
+      gaps.some((gap) => gap.reason === "no_scheduled_samples") ? "窗口内无计划采样点" : ""].filter(Boolean).join("；")}，已保留空槽。
+  </p> : null;
   const objectButtons = (compact = false) => <aside aria-label="选择图表对象"
     className={compact ? "hidden min-h-0 min-w-0 overflow-auto border-l border-border pl-2 @min-[420px]:block" : "min-h-0 min-w-0 overflow-auto border-t border-border pt-3 @min-[560px]:border-t-0 @min-[560px]:border-l @min-[560px]:pl-3 @min-[560px]:pt-0"}>
     <div className={`${compact ? "mb-1" : "mb-2"} flex items-center justify-between text-[11px] text-muted-foreground`}>
@@ -51,6 +59,7 @@ export function InvestigationChartGroup({ group, reviewing, onCloseChart, refere
     </div>
   </aside>;
   const content = (expanded: boolean, compact = false) => compact ? <div className="@container flex h-full min-h-0 min-w-0 flex-col gap-1">
+    {gapNotice}
     {multiple ? <div className="shrink-0 @min-[420px]:hidden">
       <Select value={selected.command.chart_id} onValueChange={setSelectedId}>
         <SelectTrigger aria-label="选择图表对象" className="h-7 text-xs"><SelectValue /></SelectTrigger>
@@ -62,6 +71,7 @@ export function InvestigationChartGroup({ group, reviewing, onCloseChart, refere
       {multiple ? objectButtons(true) : null}
     </div>
   </div> : <div className={`@container min-w-0 ${expanded ? "flex h-full min-h-0 flex-col" : ""}`}>
+    {gapNotice}
     <div className={`grid min-w-0 grid-cols-1 gap-3 ${expanded ? multiple ? "flex-none @min-[560px]:min-h-0 @min-[560px]:flex-1" : "min-h-0 flex-1 grid-rows-1" : ""} ${multiple ? "@min-[560px]:grid-cols-[minmax(0,1fr)_176px] @min-[560px]:grid-rows-1" : ""}`}>
       <div className={`min-w-0 ${expanded ? `flex min-h-0 flex-col ${multiple ? "h-[480px] @min-[560px]:h-full" : "h-full"}` : ""}`}>
         {multiple ? <p className="mb-1 shrink-0 text-xs font-medium tabular-nums">{selected.label}<span className="ml-2 font-normal text-muted-foreground">{selected.command.chart.x_data[0]} 至 {selected.command.chart.x_data.at(-1)}</span></p> : null}