Build distribution analytics React component

Create a DistributionTrends component that helps bank staff visualize item distribution patterns over time.

Props:

interface DistributionTrendsProps {
  orgId: string
  itemId?: string  // optional: filter to a specific item
  dateRange: { from: Date, to: Date }
}

The component should:

1. Fetch data from GET /api/distributions?orgId=X&itemId=Y&from=Z&to=W — you'll also build this route. It returns { week: string, unitsDistributed: number, distributionCount: number }[]
2. Render a Recharts ComposedChart — bar chart for unitsDistributed, line chart on a secondary Y-axis for distributionCount
3. Include a filter bar above the chart: date range picker (use react-day-picker), item type select, partner organization select
4. Handle loading state (skeleton), empty state ('No distributions in this period'), and error state
5. All chart elements must have ARIA labels. The chart should be keyboard-navigable.

Use server components for the data fetch wrapper; client component only for the interactive filter bar and chart rendering.