ADR-013 Phase 4: frontend staging machinery + relocate printedparts; fix router crash

The staging step that makes lean per-site frontend builds possible, plus the
first plugin relocated as the pilot.

- scripts/stage-frontend.mjs: copies each chosen plugin's plugins/<name>/frontend/
  into frontend/src/.plugins-staged/<name>/ and codegens routes.gen.js. Plugin
  selection via SITE_PLUGINS (comma-separated); empty = all plugins that have a
  frontend/ (the full build). Wired as npm predev/prebuild; outputs gitignored.
- Router imports routes.gen.js and merges staged routes with the in-tree
  ./routes/*.js glob - dual-location during the transition.
- printedparts relocated: its 6 views (list/detail/form/kiosk + the settings and
  labels views from the shared dirs) moved into plugins/printedparts/frontend/
  views/, core imports rewritten to the @/ alias; routes.js is the self-contained
  route module. Its old in-tree route file is removed.

Also fixes a crash the previous commit (37c764b) shipped: slides.js exports only
`toplevel` (its child routes live in core.js), so the router's
flatMap(m => m.default) produced an undefined child and threw
"Cannot read properties of undefined (reading 'path')" at load - the whole SPA
went blank. Guarded with `m.default || []`. (The earlier "print pages are blank"
reading was this crash, not page nature.)

Verified live: /machines renders again; the relocated /printedparts list renders
identically from the staged plugin frontend; SITE_PLUGINS=machines excludes
printedparts from routes.gen. Build (via npm, runs stage) + vitest + naming green.

frontend/.gitignore

@@ -0,0 +1,4 @@
+
+# ADR-013 Phase 4 staged plugin frontends (generated by scripts/stage-frontend.mjs)
+src/.plugins-staged/
+src/router/routes.gen.js

frontend/package.json

@@ -4,7 +4,10 @@
   "private": true,
   "type": "module",
   "scripts": {
+    "stage": "node ../scripts/stage-frontend.mjs",
+    "predev": "npm run stage",
     "dev": "vite",
+    "prebuild": "npm run stage",
     "build": "vite build",
     "preview": "vite preview",
     "test": "vitest run",

frontend/src/router/index.js

@@ -6,14 +6,27 @@ import { setupComplete, setupSkipped, isSetupLoaded, refreshSetupState } from '.
 import { loadEnabledPlugins, isPluginEnabled } from '../composables/enabledPlugins'
 import { useToast } from '../composables/toast'
 import { getFacilityName } from '../utils/siteSettings'
+import { stagedChildren, stagedToplevel } from './routes.gen'
 
 // Auto-discover all route modules from routes/ directory. A module's default
 // export is AppLayout child routes; an optional `toplevel` export is full-screen
 // routes (kiosk, print pages) that live OUTSIDE AppLayout. Both let a plugin own
 // its routes, so pruning the plugin removes them with no core edit (ADR-013).
 const routeModules = import.meta.glob('./routes/*.js', { eager: true })
-const rawChildren = Object.values(routeModules).flatMap(m => m.default)
-const pluginTopLevel = Object.values(routeModules).flatMap(m => m.toplevel || [])
+// Staged plugin frontends (relocated to plugins/<name>/frontend/) are
+// aggregated into routes.gen.js by scripts/stage-frontend.mjs. In-tree route
+// files (./routes/*.js) cover plugins not yet relocated - dual-location during
+// the Phase 4 transition.
+const rawChildren = [
+  // A route file may export only `toplevel` (no AppLayout children), so guard
+  // the default with an empty array.
+  ...Object.values(routeModules).flatMap(m => m.default || []),
+  ...stagedChildren,
+]
+const pluginTopLevel = [
+  ...Object.values(routeModules).flatMap(m => m.toplevel || []),
+  ...stagedToplevel,
+]
 
 // Gather the settings pages (spread across plugin route files) and nest them
 // under a single two-pane shell so the grouped rail stays put while the right

frontend/src/router/routes/printedparts.js

@@ -1,61 +0,0 @@
-/**
- * Printedparts plugin routes.
- *
- * Auto-discovered by the router via import.meta.glob, so no registration
- * edit is needed. Every route carries meta.plugin 'printedparts' so the ADR-009
- * guard redirects to the dashboard when the printedparts backend plugin is
- * disabled. Form routes add requiresAuth so anonymous users cannot reach
- * create or edit.
- */
-export default [
-  {
-    path: 'printedparts',
-    name: 'printedparts',
-    component: () => import('../../views/printedparts/PrintedItemsList.vue'),
-    meta: { requiresAuth: true, plugin: 'printedparts' }
-  },
-  {
-    path: 'printedparts/new',
-    name: 'printedparts-new',
-    component: () => import('../../views/printedparts/PrintedItemForm.vue'),
-    meta: { requiresAuth: true, plugin: 'printedparts' }
-  },
-  {
-    path: 'printedparts/:id',
-    name: 'printedparts-detail',
-    component: () => import('../../views/printedparts/PrintedItemDetail.vue'),
-    meta: { requiresAuth: true, plugin: 'printedparts' }
-  },
-  {
-    path: 'printedparts/:id/edit',
-    name: 'printedparts-edit',
-    component: () => import('../../views/printedparts/PrintedItemForm.vue'),
-    meta: { requiresAuth: true, plugin: 'printedparts' }
-  },
-  {
-    path: 'settings/printedparts',
-    name: 'settings-printedparts',
-    component: () => import('../../views/settings/PrintedPartsSettings.vue'),
-    meta: { requiresAuth: true, requiresAdmin: true, plugin: 'printedparts' }
-  }
-]
-
-// Full-screen routes (outside AppLayout), collected by the router's `toplevel`
-// pass so pruning printedparts removes them without a core edit (ADR-013).
-export const toplevel = [
-  {
-    // Touch kiosk for taking 3D-printed parts: scan bin, scan badge, keypad.
-    // Open on purpose - see the decision record in the printedparts proposal.
-    path: '/parts-kiosk',
-    name: 'parts-kiosk',
-    component: () => import('../../views/printedparts/PartsKiosk.vue'),
-    meta: { plugin: 'printedparts' }
-  },
-  {
-    // Requires login: lists the whole catalog, printedparts.view-gated at the API.
-    path: '/print/printedparts-labels',
-    name: 'print-printedparts-labels',
-    component: () => import('../../views/print/PrintedPartsLabels.vue'),
-    meta: { requiresAuth: true, plugin: 'printedparts' }
-  }
-]

plugins/printedparts/frontend/routes.js

@@ -0,0 +1,58 @@
+/**
+ * Printedparts plugin frontend routes (ADR-013 Phase 4: self-contained plugin
+ * frontend). Views live beside this file under views/; core imports use the
+ * @/ alias. The stage-frontend step copies this whole frontend/ dir into the
+ * Vite tree and aggregates these routes, so a per-site build that omits
+ * printedparts carries none of this code.
+ *
+ * `default` = AppLayout child routes; `toplevel` = full-screen routes.
+ */
+export default [
+  {
+    path: 'printedparts',
+    name: 'printedparts',
+    component: () => import('./views/PrintedItemsList.vue'),
+    meta: { requiresAuth: true, plugin: 'printedparts' }
+  },
+  {
+    path: 'printedparts/new',
+    name: 'printedparts-new',
+    component: () => import('./views/PrintedItemForm.vue'),
+    meta: { requiresAuth: true, plugin: 'printedparts' }
+  },
+  {
+    path: 'printedparts/:id',
+    name: 'printedparts-detail',
+    component: () => import('./views/PrintedItemDetail.vue'),
+    meta: { requiresAuth: true, plugin: 'printedparts' }
+  },
+  {
+    path: 'printedparts/:id/edit',
+    name: 'printedparts-edit',
+    component: () => import('./views/PrintedItemForm.vue'),
+    meta: { requiresAuth: true, plugin: 'printedparts' }
+  },
+  {
+    path: 'settings/printedparts',
+    name: 'settings-printedparts',
+    component: () => import('./views/PrintedPartsSettings.vue'),
+    meta: { requiresAuth: true, requiresAdmin: true, plugin: 'printedparts' }
+  }
+]
+
+export const toplevel = [
+  {
+    // Touch kiosk for taking 3D-printed parts: scan bin, scan badge, keypad.
+    path: '/parts-kiosk',
+    name: 'parts-kiosk',
+    component: () => import('./views/PartsKiosk.vue'),
+    meta: { plugin: 'printedparts' }
+  },
+  {
+    // Requires login: lists the whole catalog, printedparts.view-gated at the API.
+    path: '/print/printedparts-labels',
+    name: 'print-printedparts-labels',
+    component: () => import('./views/PrintedPartsLabels.vue'),
+    meta: { requiresAuth: true, plugin: 'printedparts' }
+  }
+]

plugins/printedparts/frontend/views/PartsKiosk.vue

@@ -91,9 +91,9 @@
 
 <script setup>
 import { ref, onMounted, onBeforeUnmount } from 'vue'
-import { printedpartsApi } from '../../api'
-import { withBase } from '../../utils/basePath'
-import TouchKeypad from '../../components/TouchKeypad.vue'
+import { printedpartsApi } from '@/api'
+import { withBase } from '@/utils/basePath'
+import TouchKeypad from '@/components/TouchKeypad.vue'
 
 const step = ref('item')
 const item = ref(null)

plugins/printedparts/frontend/views/PrintedItemDetail.vue

@@ -182,9 +182,9 @@
 <script setup>
 import { ref, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
-import { printedpartsApi } from '../../api'
-import { withBase } from '../../utils/basePath'
-import Modal from '../../components/Modal.vue'
+import { printedpartsApi } from '@/api'
+import { withBase } from '@/utils/basePath'
+import Modal from '@/components/Modal.vue'
 
 const route = useRoute()
 const item = ref(null)

plugins/printedparts/frontend/views/PrintedItemForm.vue

@@ -74,8 +74,8 @@
 <script setup>
 import { ref, computed, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { printedpartsApi } from '../../api'
-import { withBase } from '../../utils/basePath'
+import { printedpartsApi } from '@/api'
+import { withBase } from '@/utils/basePath'
 
 const route = useRoute()
 const router = useRouter()

plugins/printedparts/frontend/views/PrintedItemsList.vue

@@ -91,10 +91,10 @@
 
 <script setup>
 import { ref, onMounted } from 'vue'
-import { printedpartsApi } from '../../api'
-import PaginationBar from '../../components/PaginationBar.vue'
+import { printedpartsApi } from '@/api'
+import PaginationBar from '@/components/PaginationBar.vue'
 import { useListQuery } from '@/composables/listQuery'
-import { withBase } from '../../utils/basePath'
+import { withBase } from '@/utils/basePath'
 
 const items = ref([])
 const loading = ref(true)

plugins/printedparts/frontend/views/PrintedPartsLabels.vue

@@ -52,7 +52,7 @@
 <script setup>
 import { ref, computed, onMounted, watch, nextTick } from 'vue'
 import JsBarcode from 'jsbarcode'
-import { printedpartsApi } from '../../api'
+import { printedpartsApi } from '@/api'
 
 const items = ref([])
 const selectedItems = ref([])

scripts/stage-frontend.mjs

@@ -0,0 +1,61 @@
+// Stage plugin frontends into the Vite tree (ADR-013 Phase 4).
+//
+// Each plugin that owns UI keeps it self-contained under
+// plugins/<name>/frontend/ (routes.js + views/). This script copies the CHOSEN
+// plugins' frontend dirs into frontend/src/.plugins-staged/<name>/ and codegens
+// frontend/src/router/routes.gen.js, which the router imports. A per-site build
+// selects plugins via the SITE_PLUGINS env (comma-separated); with none set,
+// every plugin that has a frontend/ is staged (the default full build).
+//
+// Both outputs are generated (gitignored). Run by npm predev/prebuild.
+
+import { readdirSync, existsSync, rmSync, cpSync, writeFileSync, mkdirSync } from 'fs'
+import { join, dirname } from 'path'
+import { fileURLToPath } from 'url'
+
+const repoRoot = join(dirname(fileURLToPath(import.meta.url)), '..')
+const pluginsDir = join(repoRoot, 'plugins')
+const stagedDir = join(repoRoot, 'frontend', 'src', '.plugins-staged')
+const genFile = join(repoRoot, 'frontend', 'src', 'router', 'routes.gen.js')
+
+const requested = (process.env.SITE_PLUGINS || '')
+  .split(',').map(s => s.trim()).filter(Boolean)
+
+const withFrontend = readdirSync(pluginsDir, { withFileTypes: true })
+  .filter(entry => entry.isDirectory()
+    && existsSync(join(pluginsDir, entry.name, 'frontend', 'routes.js')))
+  .map(entry => entry.name)
+
+const chosen = requested.length
+  ? withFrontend.filter(name => requested.includes(name))
+  : withFrontend
+
+// Copy each chosen plugin's frontend dir into the staging area (clean first so
+// a removed plugin does not linger).
+rmSync(stagedDir, { recursive: true, force: true })
+mkdirSync(stagedDir, { recursive: true })
+for (const name of chosen) {
+  cpSync(join(pluginsDir, name, 'frontend'), join(stagedDir, name),
+    { recursive: true })
+}
+
+// Codegen the aggregation the router imports. `toplevel` is optional per plugin.
+const lines = ['// AUTO-GENERATED by scripts/stage-frontend.mjs - do not edit.']
+const childParts = []
+const topParts = []
+for (const name of chosen) {
+  const id = 'p_' + name.replace(/[^a-zA-Z0-9]/g, '_')
+  lines.push(
+    `import ${id}Default, { toplevel as ${id}Top } from `
+    + `'../.plugins-staged/${name}/routes.js'`)
+  childParts.push(`...(${id}Default || [])`)
+  topParts.push(`...(${id}Top || [])`)
+}
+lines.push('')
+lines.push(`export const stagedChildren = [${childParts.join(', ')}]`)
+lines.push(`export const stagedToplevel = [${topParts.join(', ')}]`)
+lines.push('')
+writeFileSync(genFile, lines.join('\n'))
+
+console.log(`staged ${chosen.length} plugin frontend(s): `
+  + (chosen.join(', ') || '(none)'))