rememberLog prepended only '[hermes] ' to each line, so desktop.log and
the in-app RECENT LOGS view carried no timestamps while agent.log and
gateway.log (Python logging) did.
Extract the line format into a small pure helper (desktop-log-line.ts)
and prefix each line with an ISO-8601 UTC timestamp shared per chunk,
matching the Python-side convention. Regression tests assert the shape
contract: timestamp + [hermes] tag + verbatim message. Fixes#84405.
Chen Jin
1dbeb47497