fix(HH-576): normalize realtime message timestamps (#148)

Co-authored-by: Rogee <rogee@ipao.vip>

frontend/app/javascript/shared/helpers/timeHelper.js

@@ -6,6 +6,28 @@ import {
   differenceInDays,
 } from 'date-fns';
 
+const normalizeTimestamp = value => {
+  const numericValue =
+    typeof value === 'string' && value.trim() ? Number(value) : value;
+  if (typeof numericValue === 'number' && Number.isFinite(numericValue)) {
+    return Math.abs(numericValue) < 1e12 ? numericValue * 1000 : numericValue;
+  }
+  if (typeof value !== 'string') return null;
+
+  const timestamp = Date.parse(value);
+  return Number.isNaN(timestamp) ? null : timestamp;
+};
+
+export const isNewerTimestamp = (currentTimestamp, nextTimestamp) => {
+  if (currentTimestamp == null || nextTimestamp == null) return true;
+
+  const next = normalizeTimestamp(nextTimestamp);
+  if (next === null) return false;
+
+  const current = normalizeTimestamp(currentTimestamp);
+  return current === null || next > current;
+};
+
 /**
  * Formats a Unix timestamp into a human-readable time format.
  * @param {number} time - Unix timestamp.