Run homepage compress in parallel

frontend/src/pages/HomePage.vue

@@ -30,6 +30,7 @@ const dragActive = ref(false)
 
 const items = ref<UploadItem[]>([])
 const busy = computed(() => items.value.some((x) => x.status === 'compressing'))
+const maxParallel = 3
 
 const alert = ref<{ type: 'info' | 'success' | 'error'; message: string } | null>(null)
 const sendingVerification = ref(false)
@@ -133,10 +134,25 @@ async function runOne(item: UploadItem) {
 
 async function runAll() {
   alert.value = null
-  for (const item of items.value) {
+  const queue = items.value.filter((item) => item.status !== 'done')
-    if (item.status === 'done') continue
+  if (queue.length === 0) return
+
+  let cursor = 0
+  const worker = async () => {
+    while (cursor < queue.length) {
+      const item = queue[cursor]
+      cursor += 1
+      if (item) {
         await runOne(item)
       }
+    }
+  }
+
+  const workers = Array.from(
+    { length: Math.min(maxParallel, queue.length) },
+    () => worker(),
+  )
+  await Promise.all(workers)
 }
 
 async function download(item: UploadItem) {