fix(charts): simplify time labels in investigation views

src/features/agent/components/agent-ui-envelope-renderer.tsx

@@ -1,6 +1,7 @@
 import { Activity, BarChart3, Database, History, LineChart, MonitorCog } from "lucide-react";
 import { AnimatePresence, MotionConfig, motion } from "motion/react";
 import { memo, type ReactNode } from "react";
+import { formatChartDisplayText, withChartDisplayTimes } from "@/shared/utils/date-time-text";
 import { StatusIcon } from "@/shared/ui/status";
 import { StandaloneInteractiveChart } from "../answer-ui/interactive-chart";
 import { normalizeSafeChartData, parseChartSpec } from "../chart-data";
@@ -78,8 +79,12 @@ export const AgentChartView = memo(function AgentChartView({ chart, embedded = f
 });
 
 function SafeChartEnvelope({ envelope, embedded = false, expanded = false }: { envelope: Extract<UIEnvelope, { kind: "chart" }>; embedded?: boolean; expanded?: boolean }) {
-  const spec = parseChartSpec(envelope.spec);
-  const data = normalizeSafeChartData(envelope.data, 100);
+  const parsed = parseChartSpec(envelope.spec);
+  const raw = normalizeSafeChartData(envelope.data, 100);
+  const displayed = withChartDisplayTimes({ title: parsed.title ?? "Agent 图表", x_axis_name: parsed.xAxisName,
+    x_data: raw?.xData ?? [], series: raw?.series ?? [] });
+  const spec = { ...parsed, title: displayed.title, xAxisName: displayed.x_axis_name };
+  const data = raw ? { ...raw, xData: displayed.x_data, series: displayed.series } : null;
 
   if (!data || data.series.length === 0 || data.xData.length === 0) {
     return <FallbackText text={envelope.fallbackText ?? "图表数据未通过前端安全子集校验。"} />;
@@ -206,7 +211,7 @@ function getEnvelopeIcon(envelope: UIEnvelope) {
 function getEnvelopeTitle(envelope: UIEnvelope) {
   if (envelope.kind === "chart") {
     const spec = parseChartSpec(envelope.spec);
-    return spec.title ?? "Agent 图表";
+    return formatChartDisplayText(spec.title ?? "Agent 图表");
   }
 
   if (envelope.kind === "registered_component") {