fix(charts): simplify time labels in investigation views

src/shared/utils/date-time-text.ts

@@ -41,3 +41,32 @@ export function formatDisplayText(text: string | null | undefined): string {
     });
   }).join("");
 }
+
+/** Chart labels use the display clock without repeating its zone to readers. */
+export function formatChartDisplayText(value: string): string {
+  return formatDisplayText(value)
+    .replace(/[（(]\s*(?:上海时间|Asia\/Shanghai|UTC\s*\+\s*8(?::00)?)\s*[）)]/g, "")
+    .replace(/(?:上海时间|Asia\/Shanghai|UTC\s*\+\s*8(?::00)?)(?![\w:+-])\s*/g, "")
+    .replace(/[，,]\s*([）)])/g, "$1")
+    .trim();
+}
+
+type ChartDisplayFields = {
+  title: string;
+  x_axis_name?: string;
+  y_axis_name?: string;
+  x_data: string[];
+  series: Array<{ name: string }>;
+};
+
+/** Preserve values and original sample timestamps; convert only visible labels. */
+export function withChartDisplayTimes<T extends ChartDisplayFields>(chart: T): T {
+  const utcAxis = /UTC(?:\s*\+?0(?::00)?)?(?![\w+:-])/.test(chart.x_axis_name ?? "");
+  const bareTime = /^(?:\d{4}-\d{2}-\d{2}[T ])?\d{2}:\d{2}(?::\d{2}(?:\.\d{1,9})?)?$/;
+  return { ...chart,
+    title: formatChartDisplayText(chart.title),
+    ...(chart.x_axis_name ? { x_axis_name: formatChartDisplayText(chart.x_axis_name.replace(/UTC(?:\s*\+?0(?::00)?)?(?![\w+:-])/g, "UTC+8")) || "时间" } : {}),
+    x_data: chart.x_data.map((label) => formatChartDisplayText(utcAxis && bareTime.test(label) ? `${label} UTC` : label)),
+    series: chart.series.map((series) => ({ ...series, name: formatChartDisplayText(series.name) }))
+  };
+}