E-Mail Ordner einklappbar machen

KI-AGENT: Ergänzt auf- und zuklappbare IMAP-Ordner in der E-Mail Übersicht. Elternordner bleiben initial sichtbar, ausgewählte Unterordner öffnen automatisch ihre übergeordneten Ordner.

frontend/pages/email/index.vue

@@ -69,6 +69,7 @@ const loadingMailboxes = ref(false)
 const loadingMessages = ref(false)
 const loadingMessage = ref(false)
 const syncing = ref(false)
+const expandedMailboxPaths = ref<string[]>([])
 
 const selectedAccount = computed(() =>
     accounts.value.find((account) => account.id === selectedAccountId.value) || null
@@ -144,10 +145,13 @@ const mailboxTree = computed(() => {
 })
 
 const mailboxRows = computed(() => {
-  const rows: Array<{ mailbox: EmailMailbox; depth: number }> = []
+  const rows: Array<{ mailbox: EmailMailbox; depth: number; hasChildren: boolean }> = []
   const append = (node: EmailMailboxNode, depth: number) => {
-    rows.push({ mailbox: node.mailbox, depth })
+    const expanded = expandedMailboxPaths.value.includes(node.mailbox.path)
-    node.children.forEach((child) => append(child, depth + 1))
+    rows.push({ mailbox: node.mailbox, depth, hasChildren: node.children.length > 0 })
+    if (expanded) {
+      node.children.forEach((child) => append(child, depth + 1))
+    }
   }
 
   mailboxTree.value.forEach((node) => append(node, 0))
@@ -186,6 +190,47 @@ const mailboxLabel = (mailbox: EmailMailbox) => {
   return mailbox.name || mailbox.path
 }
 
+const isMailboxExpanded = (mailbox: EmailMailbox) => expandedMailboxPaths.value.includes(mailbox.path)
+
+const expandMailboxPath = (path: string) => {
+  if (!expandedMailboxPaths.value.includes(path)) {
+    expandedMailboxPaths.value = [...expandedMailboxPaths.value, path]
+  }
+}
+
+const collapseMailboxPath = (path: string) => {
+  expandedMailboxPaths.value = expandedMailboxPaths.value.filter((item) => item !== path)
+}
+
+const toggleMailboxExpanded = (mailbox: EmailMailbox) => {
+  if (isMailboxExpanded(mailbox)) {
+    collapseMailboxPath(mailbox.path)
+  } else {
+    expandMailboxPath(mailbox.path)
+  }
+}
+
+const expandMailboxAncestors = (path: string) => {
+  const mailbox = mailboxes.value.find((item) => item.path === path)
+  if (!mailbox) return
+
+  const delimiter = mailboxDelimiter(mailbox)
+  const parts = path.split(delimiter)
+
+  while (parts.length > 1) {
+    parts.pop()
+    expandMailboxPath(parts.join(delimiter))
+  }
+}
+
+const resetExpandedMailboxes = () => {
+  const roots = mailboxTree.value.map((node) => node.mailbox.path)
+  expandedMailboxPaths.value = Array.from(new Set([
+    ...roots,
+    ...expandedMailboxPaths.value.filter((path) => mailboxes.value.some((mailbox) => mailbox.path === path)),
+  ]))
+}
+
 const formatAddress = (address?: EmailAddress | null) => {
   if (!address) return "Unbekannt"
   return address.name || address.address || "Unbekannt"
@@ -254,8 +299,10 @@ async function loadMailboxes() {
 
   try {
     mailboxes.value = await $api(`/api/email/accounts/${selectedAccountId.value}/mailboxes`)
+    resetExpandedMailboxes()
     const inbox = mailboxes.value.find((mailbox) => mailbox.specialUse === "\\Inbox" || mailbox.path.toUpperCase() === "INBOX")
     selectedMailboxPath.value = inbox?.path || mailboxes.value[0]?.path || "INBOX"
+    expandMailboxAncestors(selectedMailboxPath.value)
     await loadMessages()
   } finally {
     loadingMailboxes.value = false
@@ -286,6 +333,7 @@ async function loadMessages() {
 
 async function selectMailbox(mailbox: EmailMailbox) {
   selectedMailboxPath.value = mailbox.path
+  expandMailboxAncestors(mailbox.path)
   await loadMessages()
 }
 
@@ -467,9 +515,14 @@ onMounted(loadAccounts)
               @click="selectMailbox(row.mailbox)"
           >
             <UIcon
-                v-if="row.depth > 0"
+                v-if="row.hasChildren"
-                name="i-heroicons-chevron-right"
+                :name="isMailboxExpanded(row.mailbox) ? 'i-heroicons-chevron-down' : 'i-heroicons-chevron-right'"
                 class="size-3 shrink-0 text-dimmed"
+                @click.stop="toggleMailboxExpanded(row.mailbox)"
+            />
+            <span
+                v-else
+                class="size-3 shrink-0"
             />
             <UIcon :name="mailboxIcon(row.mailbox)" class="size-4 shrink-0" />
             <span class="min-w-0 flex-1 truncate">{{ mailboxLabel(row.mailbox) }}</span>