Move the no-I/O, no-ImGui series helpers (resampleHistory, bucketBySeconds,
sparklineSeries, chartSeries) out of market_tab.cpp into an inline header under
data/ (mirroring data/portfolio.h) and cover them with a testMarketSeries()
group in test_phase4.cpp (resample block averaging + partial blocks, window
bucketing + guards, sparkline fallback, chart time-window filtering + live
timestamp synthesis). market_tab now calls data::sparklineSeries/chartSeries.
No behavior change.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
DanS
a0fd9aff82