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.test.ts

@@ -149,6 +149,42 @@ describe("buildSceneFrame", () => {
     expect(frame.stats.missingLinks).toBe(2);
   });
 
+  it("builds a SCADA-only frame when the matching simulation frame is absent", () => {
+    const frame = buildSceneFrame({
+      queryTime: new Date("2026-09-14T09:30:00.000Z"),
+      model,
+      nodeRows: [],
+      linkRows: [],
+      pressureDevices: [
+        { device_id: "S-1", device_type: "pressure", node_id: "J-1" },
+      ],
+      scadaRows: [
+        {
+          time: "2026-09-14T09:30:00.000Z",
+          device_id: "S-1",
+          monitored_value: 30.8,
+          cleaned_value: 30.9,
+        },
+      ],
+    });
+
+    expect(frame.resultTime).toBe("2026-09-14T09:30:00.000Z");
+    expect(frame.payload?.nodes["J-1"]).toEqual({
+      pressure: 30.9,
+      source: "scada",
+      deviceId: "S-1",
+    });
+    expect(frame.payload?.links).toEqual({});
+    expect(frame.stats).toMatchObject({
+      simulationNodes: 0,
+      simulationLinks: 0,
+      scadaOverrides: 1,
+    });
+    expect(frame.warnings).toEqual([
+      "当前时刻无在线模拟结果，已显示 SCADA 监测点。",
+    ]);
+  });
+
   it("ignores IDs outside the scene model instead of rejecting the frame", () => {
     const frame = buildSceneFrame({
       queryTime: new Date("2026-09-11T03:00:00.000Z"),
@@ -261,4 +297,39 @@ describe("buildSceneFrame", () => {
       "SCADA 数据暂不可用，当前仅显示模拟结果。",
     ]);
   });
+
+  it("keeps the SCADA-only warning returned by the frame builder", async () => {
+    mockApiFetch
+      .mockResolvedValueOnce({ ok: true, json: async () => [] })
+      .mockResolvedValueOnce({ ok: true, json: async () => [] })
+      .mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({ FLOW_UNITS: "LPS", PRESSURE_UNITS: "METERS" }),
+      })
+      .mockResolvedValueOnce({
+        ok: true,
+        json: async () => [
+          {
+            time: "2026-09-14T09:30:00.000Z",
+            device_id: "S-1",
+            monitored_value: 30.8,
+            cleaned_value: 30.9,
+          },
+        ],
+      });
+
+    const frame = await fetchSceneFrame({
+      queryTime: new Date("2026-09-14T09:30:00.000Z"),
+      model,
+      pressureDevices: [
+        { device_id: "S-1", device_type: "pressure", node_id: "J-1" },
+      ],
+      signal: new AbortController().signal,
+    });
+
+    expect(frame.stats.scadaOverrides).toBe(1);
+    expect(frame.warnings).toEqual([
+      "当前时刻无在线模拟结果，已显示 SCADA 监测点。",
+    ]);
+  });
 });