Shadcn Guideline: Chart — Use ChartTooltip. Description: Apply ChartTooltip for interactive charts. Do: ChartTooltip with ChartTooltipContent. Don't: Recharts Tooltip directly. Good Example: <ChartTooltip content={<ChartTooltipContent/>}/>. Bad Example: <Tooltip/> from recharts. Severity: Low. Docs: https://ui.shadcn.com/docs/components/chart.