Stellar Index v0.5.0-rc.128

[v0.5.0-rc.128] — 2026-06-19

Added

• Source activity chart: 7d window + hoverable values. The per-source
  activity chart (trade-count line over USD-volume bars) gains a 24h/7d toggle
  and a crosshair legend so both the trade count AND the USD volume are
  hoverable. /v1/sources?include=sparkline7d adds a volume_history_7d series
  (168 hourly buckets) alongside the 24h one — the source-volume-history query is
  now window-parameterized ($1::interval), with a 60s-TTL cache slot. The shared
  LineChart gains an opt-in crosshair legend; non-legend usages are unchanged.