Replace locally-defined duplicate interfaces in page.tsx,
CandleChart.tsx, SpanAnnotationManager.tsx, Toolbox.tsx,
SpanAnnotationList.tsx, and SpanPopover.tsx with imports from @/types.
- SpanAnnotation, SpanLabelType: replaced in all 6 files
- Candle, AnnotationType: replaced in CandleChart.tsx, SpanAnnotationManager.tsx, Toolbox.tsx
- Annotation (with geometry): replaced in CandleChart.tsx and Toolbox.tsx
- Chart: kept local in page.tsx (shared type has created_at: Date|number vs local number)
- Annotation in page.tsx: kept local (geometry: any) but added missing color field for compatibility
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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