fix(3d): restore complete SCADA scene context

The scene previously returned early when realtime rows were absent and selected map-tier assets for network mode, hiding SCADA markers and station interiors and floors.

Use SCADA timestamps as valid frames, render node-aligned monitor markers, and pin the full network context in the manifest regression test. Keep the timeline close action inside its drag header.

src/components/threeDimensional/sceneData.ts

@@ -157,6 +157,28 @@ const resolveCommonFrameTime = (
   )[0];
 };
 
+const resolveNearestRowTime = <T extends { time: string }>(
+  queryTime: Date,
+  rows: T[],
+) => {
+  const target = queryTime.getTime();
+  const candidates = Array.from(
+    new Set(
+      rows
+        .map((row) => toTimestamp(row.time))
+        .filter(
+          (time): time is number =>
+            time !== null &&
+            Math.abs(time - target) <= SCENE_FRAME_TOLERANCE_MS,
+        ),
+    ),
+  );
+  if (candidates.length === 0) return null;
+  return candidates.sort(
+    (left, right) => Math.abs(left - target) - Math.abs(right - target),
+  )[0];
+};
+
 const normalizeLinkStatus = (
   value: number | null,
 ): SceneLinkResult["status"] => {
@@ -210,7 +232,13 @@ export const buildSceneFrame = ({
   simulationUnits?: NetworkResultUnits;
 }): SceneFrame => {
   const selectedTime = queryTime.toISOString();
-  const frameTime = resolveCommonFrameTime(queryTime, nodeRows, linkRows);
+  const simulationFrameTime = resolveCommonFrameTime(
+    queryTime,
+    nodeRows,
+    linkRows,
+  );
+  const frameTime =
+    simulationFrameTime ?? resolveNearestRowTime(queryTime, scadaRows);
   if (frameTime === null) {
     return {
       selectedTime,
@@ -313,7 +341,10 @@ export const buildSceneFrame = ({
       missingLinks: Math.max(0, model.linkIds.size - Object.keys(links).length),
       ignoredElements,
     },
-    warnings: [],
+    warnings:
+      simulationFrameTime === null
+        ? ["当前时刻无在线模拟结果，已显示 SCADA 监测点。"]
+        : [],
   };
 };
 
@@ -404,5 +435,5 @@ export const fetchSceneFrame = async ({
     scadaRows,
     simulationUnits: networkOptions,
   });
-  return { ...frame, warnings };
+  return { ...frame, warnings: [...frame.warnings, ...warnings] };
 };