fix: limit concurrent AI background removal to 2 to prevent browser crash

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/hooks/useImages.ts

@@ -1,7 +1,29 @@
 'use client'
-import { useReducer, useCallback } from 'react'
+import { useReducer, useCallback, useRef } from 'react'
 import type { ImageItem, ImageStatus } from '@/types/images'
 
+// File d'attente avec concurrence limitée pour le pipeline IA
+const CONCURRENCY = 2
+
+function createQueue() {
+  let running = 0
+  const queue: Array<() => Promise<void>> = []
+
+  function next() {
+    if (running >= CONCURRENCY || queue.length === 0) return
+    running++
+    const task = queue.shift()!
+    task().finally(() => { running--; next() })
+  }
+
+  return {
+    enqueue(task: () => Promise<void>) {
+      queue.push(task)
+      next()
+    },
+  }
+}
+
 // ── Reducer ───────────────────────────────────────────────────────────────────
 
 type Action =
@@ -47,6 +69,7 @@ function blobToBase64(blob: Blob): Promise<string> {
 
 export function useImages() {
   const [items, dispatch] = useReducer(reducer, [])
+  const queueRef = useRef(createQueue())
 
   const update = useCallback((id: string, patch: Partial<ImageItem>) => {
     dispatch({ type: 'UPDATE', id, patch })
@@ -177,7 +200,7 @@ export function useImages() {
           }))
           dispatch({ type: 'ADD', items: newItems })
           for (const item of newItems) {
-            runPipeline(item.id, item.originalBlob, item.ref, item.feather, item.rotation, item.alphaThreshold)
+            queueRef.current.enqueue(() => runPipeline(item.id, item.originalBlob, item.ref, item.feather, item.rotation, item.alphaThreshold))
           }
         } else {
           const ref = refFromFilename(file.name)
@@ -199,7 +222,7 @@ export function useImages() {
             progress: null,
           }
           dispatch({ type: 'ADD', items: [newItem] })
-          runPipeline(newItem.id, newItem.originalBlob, newItem.ref, newItem.feather, newItem.rotation, newItem.alphaThreshold)
+          queueRef.current.enqueue(() => runPipeline(newItem.id, newItem.originalBlob, newItem.ref, newItem.feather, newItem.rotation, newItem.alphaThreshold))
         }
       }
     },