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- InstrumentChart: onDateHover callback via subscribeCrosshairMove (useRef pattern) - EventTimelineStrip: 3 rows LT/MT/CT with CSS-% bars aligned to chart X axis - Cards date-aware: crosshair drives selectedDate; dateTrend + dateSignals computed client-side from lookup maps (priceMap/indMap/sortedDates) without extra API calls - TrendCard: price, RSI, ATR, slopes, momentum, 52W range all at selected date - RegimeCard: 5 signals recomputed at selected date; regime label from server - Date badge above cards; blue tint when browsing history, grey on last date - instrument_service.py: end_date in events; price_data built before events block Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>