refactor(10-12): migrate view-level SVGs to AppIcon

- CloudStorageView: cloud icon
- SettingsView: checkCircle, exclamationCircle, x (x2)
- AccountView: checkMark (TOTP enabled indicator)
- AdminAiView: chevronDown (accordion)
- AdminUsersView: copy, check, refresh
- SettingsAccountTab: checkMark (TOTP enabled)
- TotpEnrollment: checkMark (verified state)
- CloudCredentialModal: x, chevronRight
- DocumentView: warning (cloud delete modal)
- SharedView: document icon

frontend/src/views/DocumentView.vue

@@ -122,9 +122,7 @@
         class="bg-white rounded-2xl shadow-xl p-6 max-w-sm w-full mx-4"
       >
         <div class="flex items-center gap-2 mb-2">
-          <svg class="w-5 h-5 text-amber-500 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
-          </svg>
+          <AppIcon name="warning" class="w-5 h-5 text-amber-500 shrink-0" />
           <h2 id="cloud-delete-modal-title" class="text-lg font-semibold text-gray-900">Cloud delete failed</h2>
         </div>
         <p class="text-sm text-gray-600 mb-4">
@@ -149,6 +147,7 @@
 import { ref, computed, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { formatDate, formatSize } from '../utils/formatters.js'
+import AppIcon from '../components/ui/AppIcon.vue'
 import TopicBadge from '../components/topics/TopicBadge.vue'
 import DocumentPreviewModal from '../components/documents/DocumentPreviewModal.vue'
 import { useDocumentsStore } from '../stores/documents.js'