fix: show full date in formatTimestamp for non-today timestamps

formatTimestamp rendered any timestamp that wasn't from the current day
as a bare weekday + time (e.g. "Tuesday 10:49 PM"). This made the
"Last login" field in the User Information panel ambiguous: a login from
months — or even over a year — ago was indistinguishable from a recent
one, and no year was ever shown.

Now non-today timestamps include a full date with year
(e.g. "Mar 3, 2026, 10:49 PM"), consistent with how createdAt
(formatTimestampGetDate) and message dates (date-fns) are already shown.
Same-day timestamps still render as time-only.

Closes #1313

Author: yash113gadia

packages/react/src/lib/formatTimestamp.js

@@ -10,11 +10,17 @@ const formatTimestamp = (timestamp) => {
   const options = { hour: 'numeric', minute: 'numeric', hour12: true };
   const formattedTime = date.toLocaleTimeString('en-US', options);
 
-  return isDifferentDay
-    ? `${date.toLocaleDateString('en-US', {
-        weekday: 'long',
-      })} ${formattedTime}`
-    : formattedTime;
+  if (!isDifferentDay) {
+    return formattedTime;
+  }
+
+  const formattedDate = date.toLocaleDateString('en-US', {
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric',
+  });
+
+  return `${formattedDate}, ${formattedTime}`;
 };
 
 export default formatTimestamp;