DanS 40e8128a30 feat(market): candlestick chart for per-exchange OHLC ...

The exchange candle APIs return full OHLC but we only kept the close (a line).
Now the per-exchange chart draws real candlesticks; the CoinGecko aggregate stays
a line (it's close-only).

- Adapter keeps OHLC: parseExchangeOHLC() returns open/high/low/close candles
  (parseExchangeCandles is now a close-only wrapper over it). New data/candle.h
  holds the dependency-free Candle + bucketOHLC (5-min -> hourly for the 1D view).
- Model stores exchange_ohlc_intraday/daily alongside the close series;
  refreshExchangeChart populates both. market_series::chartCandles() returns the
  bucketed OHLC for the range, empty unless the per-exchange series is active.
- The chart renders wick (low..high) + body (open..close), green up / red down,
  with a low..high y-range; the line-only bits (fill, hi/lo labels, hover tooltip)
  are gated off for candles. Falls back to the line for the aggregate / Live view.

Verified: OHLC parsers + bucketOHLC + chartCandles unit-tested; a forced-state
render shows correct candlesticks; the aggregate still draws a clean line.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-07-12 11:16:44 -05:00

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