refactor: simplify backup result handling

pages/backup.vue

@@ -107,15 +107,17 @@ type ScriptResult = {
   downloadFolders: string[]
 }
 
-const selectedBackup = ref<string | null>(null)
-const scriptResult = ref<ScriptResult>({
-  key: null as string | null,
+const emptyScriptResult = (): ScriptResult => ({
+  key: null,
   label: "",
   output: "",
   isError: false,
   downloadFolders: []
 })
 
+const selectedBackup = ref<string | null>(null)
+const scriptResult = ref<ScriptResult>(emptyScriptResult())
+
 const fetchLatestBackup = async (folder: string) => {
   const files = await $fetch<string[]>(`/api/backups?folder=${encodeURIComponent(folder)}`)
   return files[0] || null
@@ -130,8 +132,16 @@ const triggerDownload = (folder: string, file: string) => {
   link.remove()
 }
 
+const downloadLatestBackup = async (folder: string) => {
+  const latestFile = await fetchLatestBackup(folder)
+
+  if (latestFile) {
+    triggerDownload(folder, latestFile)
+  }
+}
+
 const handleScriptResult = async (payload: ScriptResult) => {
-  scriptResult.value = payload
+  scriptResult.value = { ...emptyScriptResult(), ...payload }
 
   if (payload.isError || payload.downloadFolders.length === 0) {
     return
@@ -139,10 +149,7 @@ const handleScriptResult = async (payload: ScriptResult) => {
 
   for (const folder of payload.downloadFolders) {
     try {
-      const latestFile = await fetchLatestBackup(folder)
-      if (latestFile) {
-        triggerDownload(folder, latestFile)
-      }
+      await downloadLatestBackup(folder)
     } catch (error) {
       console.error(`Erreur telechargement automatique pour ${folder}:`, error)
     }