fix(charts): simplify time labels in investigation views

src/features/agent/answer-ui/answer-display-time.test.ts

@@ -17,7 +17,7 @@ describe("answer presentation time zone", () => {
     expect(result.elements.table.props.rows).toEqual([["2026/7/16 08:00:00（UTC+8）"]]);
     expect(result.elements.evidence.props.observed_at).toBe("2026/7/16 08:00:00（UTC+8）");
     expect(result.elements.evidence.props.evidence_id).toBe("2026-07-16T00:00:00Z");
-    expect(result.elements.chart.props.x_axis_name).toBe("时间（UTC+8）");
+    expect(result.elements.chart.props.x_axis_name).toBe("时间");
     expect(result.elements.chart.props.x_data).toEqual(["08:00"]);
     expect(JSON.stringify(spec)).toBe(original);
     expect(withAnswerDisplayTimes(result)).toEqual(result);
@@ -36,4 +36,23 @@ describe("answer presentation time zone", () => {
     expect(result.elements.table.props.rows).toEqual([["2027/1/1 01:00:00（UTC+8）", "00:00"]]);
     expect(withAnswerDisplayTimes(result)).toEqual(result);
   });
+  it("removes chart timezone wording while preserving the window, data and sample instants", () => {
+    const samples = ["2026-07-15T23:30:00Z", "2026-07-15T23:45:00Z"];
+    const spec: Spec = { root: "chart", elements: {
+      chart: { type: "Chart", props: {
+        title: "回放流量：487434（m³/h，上海时间 07-16 04:45–07:45）",
+        x_axis_name: "上海时间", x_data: ["07:30", "07:45"],
+        series: [{ name: "当前回放（2026-07-16，UTC+8）", data: [420, 380], sample_times: samples }]
+      }, children: [] }
+    } };
+    const result = withAnswerDisplayTimes(spec);
+    expect(result.elements.chart.props.title).toBe("回放流量：487434（m³/h，07-16 04:45–07:45）");
+    expect(result.elements.chart.props.x_axis_name).toBe("时间");
+    expect(result.elements.chart.props.x_data).toEqual(["07:30", "07:45"]);
+    expect(result.elements.chart.props.series).toEqual([
+      { name: "当前回放（2026-07-16）", data: [420, 380], sample_times: samples }
+    ]);
+    expect(withAnswerDisplayTimes(result)).toEqual(result);
+  });
+
 });

src/features/agent/answer-ui/answer-display-time.ts

@@ -1,5 +1,5 @@
 import type { Spec } from "@json-render/core";
-import { formatDisplayText } from "@/shared/utils/date-time-text";
+import { formatDisplayText, withChartDisplayTimes } from "@/shared/utils/date-time-text";
 
 const textFields = new Set(["title", "description", "summary", "text", "label", "value", "source", "observed_at"]);
 const utcLabel = /UTC(?:\s*\+?0(?::00)?)?(?![\w+:-])/;
@@ -23,14 +23,7 @@ export function withAnswerDisplayTimes(spec: Spec): Spec {
       props.columns = columns.map(timeAxis);
     }
     if (node.type === "Chart") {
-      const axis = typeof props.x_axis_name === "string" ? props.x_axis_name : "";
-      props.x_data = (props.x_data as string[]).map((label) => {
-        const displayed = displayCell(label, axis);
-        return timeAxis(axis).includes("UTC+8") ? displayed.replace(/（UTC\+8）$/, "") : displayed;
-      });
-      if (typeof props.x_axis_name === "string") props.x_axis_name = timeAxis(props.x_axis_name);
-      props.series = (props.series as Array<Record<string, unknown>>).map((series) => ({ ...series,
-        name: typeof series.name === "string" ? formatDisplayText(series.name) : series.name }));
+      Object.assign(props, withChartDisplayTimes(props as Parameters<typeof withChartDisplayTimes>[0]));
     }
     return [id, { ...node, props }];
   })) };