Add untracked chart and schema files

components/charts/hooks/use-chart-zoom.ts

@@ -0,0 +1,44 @@
+import { useState, useCallback } from 'react';
+import type { ChartZoomState } from '@/lib/types';
+
+export function useChartZoom(dataLength: number) {
+  const [zoomState, setZoomState] = useState<ChartZoomState>({
+    startIndex: 0,
+    endIndex: Math.max(0, dataLength - 1),
+    isZoomed: false
+  });
+
+  const handleZoomChange = useCallback(
+    (brushData: { startIndex?: number; endIndex?: number }) => {
+      if (
+        brushData.startIndex === undefined ||
+        brushData.endIndex === undefined
+      ) {
+        return;
+      }
+
+      setZoomState({
+        startIndex: brushData.startIndex,
+        endIndex: brushData.endIndex,
+        isZoomed:
+          brushData.startIndex !== 0 ||
+          brushData.endIndex !== dataLength - 1
+      });
+    },
+    [dataLength]
+  );
+
+  const resetZoom = useCallback(() => {
+    setZoomState({
+      startIndex: 0,
+      endIndex: Math.max(0, dataLength - 1),
+      isZoomed: false
+    });
+  }, [dataLength]);
+
+  return {
+    zoomState,
+    handleZoomChange,
+    resetZoom
+  };
+}