fix(replay): Convert performance entries against the origin they were observed with - #23068
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… observed with Replay buffers raw `PerformanceEntry` objects and only converts them to wall clock time on flush, which for a long-running session can happen minutes later and across a clock drift correction. Converting them against the origin in effect at flush time retroactively shifts every buffered entry by the drift, including the ones that were timed correctly. Stamps the current time origin onto each entry as it is observed and converts against that stamp. The stamps live in a `WeakMap` so the buffer keeps holding bare entries and its identity-based dedup is unaffected. Web vitals already convert eagerly in their instrumentation handler, so they keep using the current origin. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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