feat(10-06): wire breadcrumb mapping + toast call sites; delete FolderBreadcrumb

- FileManagerView: add mappedBreadcrumb computed ({id,label} from foldersStore.breadcrumb)
- FileManagerView: import useToastStore; add toast.show() to doMove, doDeleteDoc, onFilesSelected
- FileManagerView: remove console.error from doMove/doDeleteDoc (toast communicates errors)
- CloudFolderView: add mappedBreadcrumb computed; pass to StorageBrowser :breadcrumb
- Delete FolderBreadcrumb.vue + FolderBreadcrumb.test.js (no dead code per CLAUDE.md)
- FileManagerView.test.js: replace dead FolderBreadcrumb mock with BreadcrumbBar mock
- StorageBrowser.skeleton.test.js: remove unused FolderBreadcrumb stub
- Full suite: 164/164 pass, 0 failures

frontend/src/views/CloudFolderView.vue

@@ -3,7 +3,7 @@
     mode="cloud"
     :folders="folders"
     :files="files"
-    :breadcrumb="breadcrumb"
+    :breadcrumb="mappedBreadcrumb"
     :upload-queue="uploadQueue"
     :loading="loading"
     :empty-message="error || 'This folder is empty'"
@@ -45,6 +45,10 @@ const breadcrumb = computed(() => {
   }))
 })
 
+const mappedBreadcrumb = computed(() =>
+  breadcrumb.value.map(f => ({ id: f.id, label: f.name }))
+)
+
 async function load() {
   loading.value = true
   error.value = ''

frontend/src/views/FileManagerView.vue

@@ -3,7 +3,7 @@
     mode="local"
     :folders="foldersStore.folders"
     :files="docsStore.documents"
-    :breadcrumb="foldersStore.breadcrumb"
+    :breadcrumb="mappedBreadcrumb"
     :upload-queue="uploadQueue"
     :loading="docsStore.loading || foldersStore.loading"
     :search-query="docsStore.searchQuery"
@@ -49,6 +49,7 @@ import { useRoute, useRouter } from 'vue-router'
 import { useFoldersStore } from '../stores/folders.js'
 import { useDocumentsStore } from '../stores/documents.js'
 import { useTopicsStore } from '../stores/topics.js'
+import { useToastStore } from '../stores/toast.js'
 import StorageBrowser from '../components/storage/StorageBrowser.vue'
 import FolderDeleteModal from '../components/folders/FolderDeleteModal.vue'
 import ShareModal from '../components/sharing/ShareModal.vue'
@@ -63,6 +64,9 @@ const browserRef = ref(null)
 // ── Navigation ────────────────────────────────────────────────────────────────
 
 const currentFolderId = computed(() => route.params.folderId ?? null)
+const mappedBreadcrumb = computed(() =>
+  (foldersStore.breadcrumb || []).map(f => ({ id: f.id, label: f.name }))
+)
 
 async function loadFolder(folderId) {
   if (folderId === null) {
@@ -100,6 +104,7 @@ const uploadQueue = ref([])
 
 async function onFilesSelected({ files, autoClassify }) {
   const folderId = currentFolderId.value
+  const toast = useToastStore()
   const promises = files.map(file => {
     const item = reactive({ name: file.name, done: false, error: null, quotaError: null, topics: null })
     uploadQueue.value.unshift(item)
@@ -112,6 +117,14 @@ async function onFilesSelected({ files, autoClassify }) {
   })
   await Promise.allSettled(promises)
   await topicsStore.fetchTopics()
+  const succeeded = uploadQueue.value.slice(0, files.length).filter(i => i.done).length
+  if (succeeded === files.length) {
+    toast.show(`${succeeded} file(s) uploaded`, 'success')
+  } else if (succeeded > 0) {
+    toast.show(`${succeeded} of ${files.length} file(s) uploaded`, 'warning')
+  } else {
+    toast.show('Upload failed', 'error')
+  }
 }
 
 // ── Folder CRUD ───────────────────────────────────────────────────────────────
@@ -143,11 +156,23 @@ async function confirmDeleteFolder() {
 const shareDoc = ref(null)
 
 async function doMove(docId, folderId) {
-  try { await docsStore.moveToFolder(docId, folderId) } catch (e) { console.error(e.message) }
+  const toast = useToastStore()
+  try {
+    await docsStore.moveToFolder(docId, folderId)
+    toast.show('Document moved', 'success')
+  } catch (e) {
+    toast.show('Move failed: ' + (e.message || 'unknown error'), 'error')
+  }
 }
 
 async function doDeleteDoc(docId) {
-  try { await docsStore.remove(docId) } catch (e) { console.error(e.message) }
+  const toast = useToastStore()
+  try {
+    await docsStore.remove(docId)
+    toast.show('Document deleted', 'success')
+  } catch (e) {
+    toast.show('Delete failed: ' + (e.message || 'unknown error'), 'error')
+  }
 }
 
 // ── Topic color lookup ────────────────────────────────────────────────────────

frontend/src/views/__tests__/FileManagerView.test.js

@@ -29,8 +29,8 @@ vi.mock('../../api/client.js', () => ({
 }))
 
 // Stub heavy child components so we only test FileManagerView logic
-vi.mock('../../components/folders/FolderBreadcrumb.vue', () => ({
-  default: { template: '<nav><slot/></nav>', props: ['segments'], emits: ['navigate'] },
+vi.mock('../../components/ui/BreadcrumbBar.vue', () => ({
+  default: { template: '<nav><slot/></nav>', props: ['segments', 'rootLabel', 'showRoot'], emits: ['navigate'] },
 }))
 vi.mock('../../components/upload/DropZone.vue', () => ({
   default: { template: '<div class="dropzone"/>', emits: ['files-selected'] },