Admin Page Layout

admin-vue3 Page Layout (MUST)

Default layout for every new admin page is MasterDetailLayout. Tabs are forbidden as the top-level structural device. Pick a different option ONLY if the page has no list-like collection at all (e.g. setup wizard, login).

Why

Sidebar is already deep; adding tabs inside a page doubles the navigation cost. Master-detail mirrors how every CMS-style admin screen in this project is already shaped — projects, comments, drafts, snippets, ai/*, settings, maintenance/cron, maintenance/backup, post categories, note topics, webhooks. Consistency is the feature; do not reinvent.

The contract

import { MasterDetailLayout, useMasterDetailLayout } from '~/components/layout'

<MasterDetailLayout
  showDetailOnMobile={showDetailOnMobile.value}
  defaultSize={0.3}   // list pane proportion
  min={0.2}
  max={0.4}
>
  {{
    list:   () => <YourListPane ... />,
    detail: () => selected ? <YourDetailPane ... /> : null,
    empty:  () => <YourEmptyState />,
  }}
</MasterDetailLayout>

Pane responsibilities:

Selection state lives in the page setup, NOT inside list / detail. Page selects selectedId ref, syncs to route.query.id via watch, mobile back via showDetailOnMobile.value = false.

Header actions (top-right) use setActions(...) from useLayout() inside watchEffect — never render action buttons inside the list pane.

Building blocks (use these, do not roll your own)

• MasterDetailLayout + useMasterDetailLayout() from ~/components/layout
• useDataTable<T> from ~/hooks/use-data-table for paginated lists
• useLayout from ~/layouts/content for setActions / setHeaderClass
• HeaderActionButton from ~/components/button/header-action-button
• RelativeTime, NScrollbar, NPagination, NButton, NPopconfirm from naive-ui
• List item style: see views/manage-project/components/project-list.tsx
• Detail pane shell: see views/manage-project/components/project-detail-panel.tsx

When the page has MULTIPLE entity kinds

(e.g. enrichment screen needs to manage cache rows AND screenshot blobs AND a URL probe console)

Do not add tabs. Choose ONE of:

1. Sidebar sub-routes — each entity is its own route under the section. Sidebar grows but each page stays master-detail. Best when entities are big.
2. Source switcher inside list pane header — segmented control in the list pane top strip swaps the data source, detail pane re-binds to selected item. Good when entities share the same detail shape.
3. Dedicated detail pane modes — list pane stays homogeneous (one entity kind), secondary entities surface as embedded sections inside the detail pane.

If forced to pick one without context, pick (1).

Forbidden patterns

• Top-level NTabs inside a view component
• Full-width table-only pages (use list-pane + detail-pane instead)
• Action buttons rendered inside the list (use setActions for the top bar; row-scoped actions go on hover inside the row)
• Selection state stored inside the list component (must live in the page setup so URL/back/mobile flows work)
• Separate components for desktop/mobile — MasterDetailLayout already collapses on mobile via useMasterDetailLayout().isMobile

Reference views

Read one before writing a new page:

• views/manage-project/index.tsx — canonical list + create-or-edit detail
• views/comments/index.tsx — list + filter strip + detail viewer
• views/extra-features/snippets/index.tsx — list + create + edit
• views/ai/tasks.tsx — read-only list + read-only detail
• views/maintenance/cron.tsx — actions-heavy detail