feat(10-08): BreadcrumbBar in remaining admin views + SettingsView; EmptyState in SharedView + CloudStorageView

- AdminQuotasView: BreadcrumbBar (Quotas, showRoot=false)
- AdminAiView: BreadcrumbBar (AI Config, showRoot=false)
- AdminOverviewView: BreadcrumbBar (empty segments, showRoot=false) above existing h2
- SettingsView: BreadcrumbBar with breadcrumbSegments computed (Settings > activeTabLabel)
- SharedView: BreadcrumbBar (Shared with me) + EmptyState (icon=inbox)
- CloudStorageView: BreadcrumbBar in toolbar + EmptyState (icon=cloud) with Settings router-link CTA
- Full test suite: 178 passed, 0 failures

frontend/src/views/admin/AdminAiView.vue

@@ -1,5 +1,7 @@
 <template>
   <div>
+    <BreadcrumbBar :segments="[{ label: 'AI Config' }]" :show-root="false" class="mb-4" />
+
     <section class="bg-white rounded-xl border border-gray-200 overflow-hidden mb-6">
       <div class="px-6 py-4 border-b border-gray-200">
         <h2 class="text-sm font-semibold text-gray-900">System AI Providers (Global)</h2>
@@ -207,6 +209,7 @@ import { ref, reactive, onMounted } from 'vue'
 import * as api from '../../api/client.js'
 import { getAiConfig, saveAiConfig, testAiConnection } from '../../api/client.js'
 import SearchableModelSelect from '../../components/ui/SearchableModelSelect.vue'
+import BreadcrumbBar from '../../components/ui/BreadcrumbBar.vue'
 
 
 const _PROVIDER_DEFAULTS = {

frontend/src/views/admin/AdminOverviewView.vue

@@ -1,5 +1,7 @@
 <template>
   <div>
+    <BreadcrumbBar :segments="[]" :show-root="false" class="mb-4" />
+
     <h2 class="text-xl font-semibold text-gray-900 mb-6">Overview</h2>
 
     <div v-if="loading" class="text-gray-500">Loading overview…</div>
@@ -71,6 +73,7 @@
 import { ref, onMounted } from 'vue'
 import { getAdminOverview } from '../../api/admin.js'
 import { formatSize, formatDate } from '../../utils/formatters.js'
+import BreadcrumbBar from '../../components/ui/BreadcrumbBar.vue'
 
 const loading = ref(false)
 const error = ref(null)

frontend/src/views/admin/AdminQuotasView.vue

@@ -1,5 +1,7 @@
 <template>
   <div>
+    <BreadcrumbBar :segments="[{ label: 'Quotas' }]" :show-root="false" class="mb-4" />
+
     <div v-if="loading" class="bg-white rounded-xl border border-gray-200 p-8 text-center">
       <div class="flex items-center justify-center gap-2 text-gray-400 text-sm">
         <span class="animate-spin rounded-full border-2 border-current border-t-transparent w-4 h-4"></span>
@@ -87,6 +89,7 @@
 <script setup>
 import { ref, reactive, onMounted } from 'vue'
 import * as api from '../../api/client.js'
+import BreadcrumbBar from '../../components/ui/BreadcrumbBar.vue'
 
 const rows = ref([])
 const loading = ref(false)