fix(tools): keep results when a timestamp is outside Date's range (#1045)

isoTime returned toISOString() for any finite number, which throws past ±8.64e15 ms, so one bad record (e.g. a bike-share last_reported) failed the whole tool answer. Such timestamps are now null. The voice analyst's result rows had the same conversion and get the same guard.

Co-authored-by: Sameh Khamis <[email protected]>

src/tools/results.js

@@ -24,7 +24,9 @@ export function capRows(rows, limit = DEFAULT_LIMIT) {
 
 /** Format an epoch millisecond time as ISO 8601, or null. */
 export function isoTime(ms) {
-  return Number.isFinite(ms) ? new Date(ms).toISOString() : null;
+  if (!Number.isFinite(ms)) return null;
+  const date = new Date(ms);
+  return Number.isFinite(date.getTime()) ? date.toISOString() : null;
 }
 
 /** "1 earthquake", "3 earthquakes". */