Update SankeyDiagram component to adjust link and node dimensions

This commit modifies the MAX_LINK_HEIGHT constant to 56 and updates the nodeGap, minHeight, and verticalPadding values for improved layout and spacing in the SankeyDiagram component. These changes enhance the visual representation of the diagram, ensuring better usability and aesthetics.

Author: goldflag

client/src/app/[site]/journeys/components/SankeyDiagram.tsx

@@ -5,7 +5,7 @@ import { useTheme } from "next-themes";
 import { useEffect, useRef } from "react";
 
 const MIN_LINK_HEIGHT = 0;
-const MAX_LINK_HEIGHT = 100;
+const MAX_LINK_HEIGHT = 56;
 const MIN_NODE_HEIGHT = 2;
 
 interface Journey {
@@ -110,9 +110,9 @@ export function SankeyDiagram({ journeys, steps, maxJourneys, domain }: SankeyDi
     const width = containerWidth;
     const stepWidth = width / steps;
     const stepSpacing = stepWidth - nodeWidth;
-    const nodeGap = 20; // Gap between nodes
-    const minHeight = 200;
-    const verticalPadding = 10;
+    const nodeGap = 10;
+    const minHeight = 160;
+    const verticalPadding = 6;
 
     // Calculate the total height needed for each step column
     const stepHeights = Array.from(nodesByStep.values()).map(stepNodes => {