fc3k(ui): TagMaintenanceCard — preview-then-commit prune-unused under Settings → Maintenance

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/settings/MaintenancePanel.vue

@@ -13,6 +13,7 @@
     <AllowlistTable class="mt-4" />
     <AliasTable class="mt-4" />
     <BackupCard class="mt-6" />
+    <TagMaintenanceCard class="mt-6" />
     <BrowserExtensionCard class="mt-6" />
     <LegacyMigrationCard class="mt-6" />
   </div>
@@ -25,6 +26,7 @@ import MLThresholdSliders from './MLThresholdSliders.vue'
 import AllowlistTable from './AllowlistTable.vue'
 import AliasTable from './AliasTable.vue'
 import BackupCard from './BackupCard.vue'
+import TagMaintenanceCard from './TagMaintenanceCard.vue'
 import BrowserExtensionCard from './BrowserExtensionCard.vue'
 import LegacyMigrationCard from './LegacyMigrationCard.vue'
 </script>