Line Mode (default): click and drag to draw a freehand line — it is sampled into N points, normalized, and matched against candlestick close windows.  Candle Mode: click + Add candle, click a bar to set its close, drag handles for open/high/low. Sample & Save → Scan runs the scan right here — matches (with similarity scores, entry/stop/target and a chart) render below. Export JSON downloads the pattern instead.