Layout additions: breadcrumbs, global drop zone, sticky MOTD

- Route-derived SiteBreadcrumb below the MOTD on all non-index
  pages; separator icon switched to bxs:chevron-right-square
- GlobalDropZone moved to the layout so it works on every page;
  on thread routes it only applies to the upper half of the
  viewport (comment attachments keep their own zone)
- MOTD banner is now sticky below the site header

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/components/GlobalDropZone.vue

@@ -0,0 +1,80 @@
+<script setup lang="ts">
+import { useDropZone, useEventListener } from '@vueuse/core'
+import { toast } from 'vue-sonner'
+import { isMediaFile, isMediaItemType } from '~~/shared/utils/media'
+
+const { t } = useI18n()
+const { user } = useAuth()
+const route = useRoute()
+const dropTarget = shallowRef<HTMLElement>()
+const uploading = ref(false)
+
+// In Threads gilt die Zone nur für die obere Bildschirmhälfte —
+// die untere Hälfte gehört den Kommentaren (dort Anhänge, sonst nichts)
+const topHalfOnly = computed(() => route.path.startsWith('/thread/'))
+const pointerY = ref(0)
+const inTopHalf = computed(() => !topHalfOnly.value || pointerY.value < (import.meta.client ? window.innerHeight : 0) / 2)
+
+onMounted(() => {
+  dropTarget.value = document.body
+})
+
+// Zonen wie das Kommentarfeld stoppen die Events per stopPropagation —
+// Drops dort landen als Anhang und nicht hier
+const { isOverDropZone } = useDropZone(dropTarget, {
+  dataTypes: types => types.some(isMediaItemType),
+  onDrop(files, event) {
+    if (topHalfOnly.value && event.clientY >= window.innerHeight / 2) return
+    const valid = (files ?? []).filter(isMediaFile)
+    if (valid.length && !uploading.value) uploadFiles(valid)
+    else if (files?.length) toast.error(t('upload.onlyMedia'))
+  },
+})
+
+// Verhindert, dass der Browser gedroppte Dateien außerhalb der Zone als Tab öffnet
+useEventListener('dragover', (e: DragEvent) => {
+  pointerY.value = e.clientY
+  if (e.dataTransfer?.types.includes('Files')) e.preventDefault()
+})
+useEventListener('drop', (e: DragEvent) => {
+  if (e.dataTransfer?.types.includes('Files')) e.preventDefault()
+})
+
+async function uploadFiles(files: File[]) {
+  if (!user.value) {
+    toast.error(t('upload.loginToUploadToast'))
+    return
+  }
+  uploading.value = true
+  try {
+    const results = await Promise.allSettled(files.map((file) => {
+      const formData = new FormData()
+      formData.append('file', file)
+      return $fetch('/api/uploads', { method: 'POST', body: formData })
+    }))
+    const failed = results.filter(r => r.status === 'rejected').length
+    if (failed) {
+      toast.error(t('upload.failedCount', { failed, total: files.length }))
+    }
+    await refreshNuxtData('uploads')
+    await navigateTo('/')
+  }
+  finally {
+    uploading.value = false
+  }
+}
+</script>
+
+<template>
+  <div
+    v-if="(isOverDropZone && inTopHalf) || uploading"
+    class="pointer-events-none fixed inset-0 z-50 flex items-center justify-center bg-background/80 backdrop-blur-sm"
+  >
+    <div class="flex flex-col items-center gap-3 rounded-lg border-2 border-dashed border-primary bg-background p-10">
+      <Icon name="ph:cloud-arrow-up-fill" class="size-12 text-primary" />
+      <p class="text-lg font-medium">
+        {{ uploading ? $t('upload.uploading') : $t('upload.dropToUpload') }}
+      </p>
+    </div>
+  </div>
+</template>

app/components/MotdBanner.vue

@@ -7,7 +7,7 @@ if (data.value.message) motd.value = data.value.message
 </script>
 
 <template>
-  <div v-if="motd" class="border-b px-4 py-2 lg:px-6">
+  <div v-if="motd" class="sticky top-(--header-height) z-10 border-b bg-background px-4 py-2 lg:px-6">
     <p class="flex items-center gap-2 text-sm">
       <Icon name="ph:warning-octagon-fill" class="size-4 shrink-0 text-muted-foreground" />
       <span class="min-w-0 whitespace-pre-wrap">{{ motd }}</span>

app/components/SiteBreadcrumb.vue

@@ -0,0 +1,52 @@
+<script setup lang="ts">
+import {
+  Breadcrumb,
+  BreadcrumbItem,
+  BreadcrumbLink,
+  BreadcrumbList,
+  BreadcrumbPage,
+  BreadcrumbSeparator,
+} from '@/components/ui/breadcrumb'
+
+const { t } = useI18n()
+const route = useRoute()
+
+interface Crumb {
+  label: string
+  to?: string
+}
+
+const crumbs = computed<Crumb[]>(() => {
+  const list: Crumb[] = [{ label: t('palette.home'), to: '/' }]
+  const p = route.path
+  if (p === '/') return []
+  if (p.startsWith('/thread/')) list.push({ label: t('nav.thread') })
+  else if (p === '/users') list.push({ label: t('nav.users') })
+  else if (p.startsWith('/user/')) {
+    list.push({ label: t('nav.users'), to: '/users' }, { label: t('nav.profile') })
+  }
+  else if (p === '/settings') list.push({ label: t('nav.settings') })
+  else if (p === '/admin') list.push({ label: t('nav.admin') })
+  else if (p === '/login') list.push({ label: t('auth.login') })
+  else if (p === '/register') list.push({ label: t('auth.register') })
+  return list
+})
+</script>
+
+<template>
+  <Breadcrumb v-if="crumbs.length > 1" class="px-4 py-2 lg:px-6">
+    <BreadcrumbList>
+      <template v-for="(crumb, i) in crumbs" :key="i">
+        <BreadcrumbItem>
+          <BreadcrumbLink v-if="crumb.to" as-child>
+            <NuxtLink :to="crumb.to">{{ crumb.label }}</NuxtLink>
+          </BreadcrumbLink>
+          <BreadcrumbPage v-else>
+            {{ crumb.label }}
+          </BreadcrumbPage>
+        </BreadcrumbItem>
+        <BreadcrumbSeparator v-if="i < crumbs.length - 1" />
+      </template>
+    </BreadcrumbList>
+  </Breadcrumb>
+</template>

app/layouts/default.vue

@@ -1,7 +1,9 @@
 <script setup lang="ts">
 import CommentsSidebar from '@/components/CommentsSidebar.vue'
 import CommandPalette from '@/components/CommandPalette.vue'
+import GlobalDropZone from '@/components/GlobalDropZone.vue'
 import MotdBanner from '@/components/MotdBanner.vue'
+import SiteBreadcrumb from '@/components/SiteBreadcrumb.vue'
 import SiteHeader from '@/components/SiteHeader.vue'
 import {
   SidebarInset,
@@ -20,6 +22,7 @@ import {
     <SidebarInset>
       <SiteHeader />
       <MotdBanner />
+      <SiteBreadcrumb />
       <div class="flex flex-1 flex-col">
         <div class="@container/main flex flex-1 flex-col gap-2">
           <div class="flex flex-1 flex-col gap-4 py-4 md:gap-6 md:py-6">
@@ -30,5 +33,6 @@ import {
     </SidebarInset>
     <CommentsSidebar />
     <CommandPalette />
+    <GlobalDropZone />
   </SidebarProvider>
 </template>