feat: show exit count when selecting a page, fix scroll fade overlay

components/journeys/ColumnJourney.tsx

@@ -262,6 +262,13 @@ function JourneyColumn({
 
 // ─── Connection Lines ───────────────────────────────────────────────
 
+interface ExitLabel {
+  x: number
+  y: number
+  count: number
+  color: string
+}
+
 function ConnectionLines({
   containerRef,
   selections,
@@ -274,12 +281,14 @@ function ConnectionLines({
   transitions: PathTransition[]
 }) {
   const [lines, setLines] = useState<(LineDef & { color: string })[]>([])
+  const [exits, setExits] = useState<ExitLabel[]>([])
   const [dimensions, setDimensions] = useState({ width: 0, height: 0 })
 
   useLayoutEffect(() => {
     const container = containerRef.current
     if (!container || selections.size === 0) {
       setLines([])
+      setExits([])
       return
     }
 
@@ -290,10 +299,10 @@ function ConnectionLines({
     })
 
     const newLines: (LineDef & { color: string })[] = []
+    const newExits: ExitLabel[] = []
 
     for (const [colIdx, selectedPath] of selections) {
       const nextCol = columns[colIdx + 1]
-      if (!nextCol) continue
 
       const sourceEl = container.querySelector(
         `[data-col="${colIdx}"][data-path="${CSS.escape(selectedPath)}"]`
@@ -311,28 +320,76 @@ function ConnectionLines({
 
       const color = colorForColumn(colIdx)
 
-      for (const t of relevantTransitions) {
-        const destEl = container.querySelector(
-          `[data-col="${colIdx + 1}"][data-path="${CSS.escape(t.to_path)}"]`
-        ) as HTMLElement | null
-        if (!destEl) continue
+      // Find total sessions for this page
+      const col = columns[colIdx]
+      const page = col?.pages.find((p) => p.path === selectedPath)
+      const pageCount = page?.sessionCount ?? 0
+      const outboundCount = relevantTransitions.reduce((sum, t) => sum + t.session_count, 0)
+      const exitCount = pageCount - outboundCount
 
-        const destRect = destEl.getBoundingClientRect()
-        const destY =
-          destRect.top + destRect.height / 2 - containerRect.top + container.scrollTop
-        const destX = destRect.left - containerRect.left + container.scrollLeft
+      if (nextCol) {
+        const maxCount = Math.max(
+          ...relevantTransitions.map((rt) => rt.session_count),
+          exitCount > 0 ? exitCount : 0
+        )
 
-        const maxCount = Math.max(...relevantTransitions.map((rt) => rt.session_count))
-        const weight = Math.max(1, Math.min(4, (t.session_count / maxCount) * 4))
+        for (const t of relevantTransitions) {
+          const destEl = container.querySelector(
+            `[data-col="${colIdx + 1}"][data-path="${CSS.escape(t.to_path)}"]`
+          ) as HTMLElement | null
+          if (!destEl) continue
 
-        newLines.push({ sourceY, destY, sourceX, destX, weight, color })
+          const destRect = destEl.getBoundingClientRect()
+          const destY =
+            destRect.top + destRect.height / 2 - containerRect.top + container.scrollTop
+          const destX = destRect.left - containerRect.left + container.scrollLeft
+
+          const weight = maxCount > 0
+            ? Math.max(1, Math.min(4, (t.session_count / maxCount) * 4))
+            : 1
+
+          newLines.push({ sourceY, destY, sourceX, destX, weight, color })
+        }
+      }
+
+      // Show exit if any visitors dropped off
+      if (exitCount > 0) {
+        // Position the exit label below the last destination or below the source
+        const lastDestY = newLines.length > 0
+          ? Math.max(...newLines.filter((l) => l.sourceX === sourceX).map((l) => l.destY))
+          : sourceY
+
+        const exitY = lastDestY + 30
+        const exitX = nextCol
+          ? ((): number => {
+              // Find the left edge of the next column
+              const nextColEl = container.querySelector(`[data-col="${colIdx + 1}"]`) as HTMLElement | null
+              if (nextColEl) {
+                const nextRect = nextColEl.getBoundingClientRect()
+                return nextRect.left - containerRect.left + container.scrollLeft
+              }
+              return sourceX + 100
+            })()
+          : sourceX + 100
+
+        newLines.push({
+          sourceY,
+          destY: exitY,
+          sourceX,
+          destX: exitX,
+          weight: 1,
+          color: '#52525b', // EXIT_GREY
+        })
+
+        newExits.push({ x: exitX, y: exitY, count: exitCount, color: '#52525b' })
       }
     }
 
     setLines(newLines)
+    setExits(newExits)
   }, [selections, columns, transitions, containerRef])
 
-  if (lines.length === 0) return null
+  if (lines.length === 0 && exits.length === 0) return null
 
   return (
     <svg
@@ -354,6 +411,19 @@ function ConnectionLines({
           />
         )
       })}
+      {exits.map((exit, i) => (
+        <g key={`exit-${i}`}>
+          <text
+            x={exit.x + 4}
+            y={exit.y + 4}
+            fontSize={11}
+            fontFamily="system-ui, -apple-system, sans-serif"
+            fill={exit.color}
+          >
+            (exit) {exit.count}
+          </text>
+        </g>
+      ))}
     </svg>
   )
 }
@@ -472,7 +542,7 @@ export default function ColumnJourney({
       </div>
       {/* Scroll fade indicator */}
       {canScrollRight && (
-        <div className="absolute top-0 right-0 bottom-0 w-16 pointer-events-none bg-gradient-to-l from-white dark:from-neutral-900 to-transparent" />
+        <div className="absolute top-0 right-0 bottom-0 w-10 pointer-events-none bg-gradient-to-l from-white/90 dark:from-neutral-900/90 to-transparent" />
       )}
     </div>
   )