fix(CLI-BH): include trace logs missing timestamp_precise in follow mode

Logs without timestamp_precise were silently dropped in follow mode
because the fallback `?? 0` always evaluates to `0 > lastTs` = false.
Use explicit undefined check to always include such logs instead.

Author: BYK

src/commands/log/list.ts

@@ -465,7 +465,11 @@ export const listCommand = buildListCommand("log", {
               statsPeriod,
             }),
           extractNew: (logs, lastTs) =>
-            logs.filter((l) => (l.timestamp_precise ?? 0) > lastTs),
+            logs.filter(
+              (l) =>
+                l.timestamp_precise === undefined ||
+                l.timestamp_precise > lastTs
+            ),
         });
       } else {
         await executeTraceSingleFetch(stdout, org, flags.trace, flags);