fix(to_timedelta): replace exec loop with matchAll to avoid shared global regex state

Agent-Logs-Url: https://github.com/githubnext/tsessebe/sessions/29d9c670-7033-40c6-baa5-3f651bf0be32

Co-authored-by: mrjf <180956+mrjf@users.noreply.github.com>

Author: Copilot

src/stats/to_timedelta.ts

@@ -369,17 +369,14 @@ function parseIso(m: RegExpExecArray): Timedelta | null {
 
 /** Parse human-readable form: "1h 30m 20s 500ms". Returns null if nothing matched. */
 function parseHuman(value: string): Timedelta | null {
-  RE_HUMAN_UNIT.lastIndex = 0; // reset global regex
   let totalMs = 0;
   let matched = false;
 
-  let match = RE_HUMAN_UNIT.exec(value);
-  while (match !== null) {
+  for (const match of value.matchAll(RE_HUMAN_UNIT)) {
     matched = true;
     const qty = Number(match[1]);
     const unit = (match[2] ?? "").toLowerCase();
     totalMs += humanUnitToMs(qty, unit);
-    match = RE_HUMAN_UNIT.exec(value);
   }
 
   return matched ? new Timedelta(totalMs) : null;