Codex review on #59 found two real gaps in the new metric switch.

The provider detail chart kept calling `costChartPoints()`, which always
read `point.cost` and formatted currency, so a provider tab in token mode
showed a cost-scaled chart above token-scaled rows. That helper and the
chart title now follow `costHistoryShowsTokens`.

`spendDailyPoints()` also skipped any provider whose `currencyCode`
differed from the first one. That filter is needed to sum money, but
token counts carry no currency, so it silently dropped whole providers
from the range chart and heatmap in token mode. It now applies in cost
mode only.

Both rules are pinned by new assertions in test_feature_parity.sh.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>