fix: align JIT and class counters in compare timelines#55
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Summary
JIT and Class Loading compare charts now keep counter values visible even when the two uploaded runs sampled at different seconds. The counter series advances to the latest observation at or before each shared frame, matching the forward-filled behavior that already made GC compare correctly.
Before this, GC could show both runs while JIT/Class only showed one run because counter metrics required exact timestamp matches on the shared compare timeline.
Verification
node --check frontend/public/compare-shared.jsnpm test -- --runInBand