feat(10.1-02): run registered toolbar actions and scope plugin CSS per controller

- ListToolbar renders server-filtered actions after delete as outline buttons, busy during their POST
- ListView posts {} to toolbar/{action}, toasts, reloads the list and refetches the header partial
- Lists load controller assets too, so other controllers' stylesheet links are disabled on every open
- Vite dev server proxies {prefix}/assets to summer serve; dist rebuilt

admin/src/components/list/ListToolbar.vue

@@ -1,21 +1,33 @@
 <script setup lang="ts">
+import { computed } from 'vue'
 import { Check, Search, Trash2 } from '@lucide/vue'
+import type { ToolbarAction } from '../../api/types'
 import { t } from '../../app/i18n'
 import Button from '../ui/Button.vue'
 
 // List toolbar (design screen 3, D-14): the search input and the toolbar
 // buttons in declared order. Delete is a disabled outline button without a
 // selection and a danger outline button next to the "selected" pill with one.
-defineProps<{
-  showSearch: boolean
-  search: string
-  searchPrompt: string
-  buttons: string[]
-  selectedCount: number
-  selectedLabel: string
-  deleteLabel: string
-}>()
-const emit = defineEmits<{ 'update:search': [value: string]; delete: [] }>()
+// A registered plugin action (D-12) is an outline button labelled from
+// `actions`, the list the server already filtered to what the admin may run;
+// it ignores the selection and is disabled and busy while its POST runs.
+const props = withDefaults(
+  defineProps<{
+    showSearch: boolean
+    search: string
+    searchPrompt: string
+    buttons: string[]
+    selectedCount: number
+    selectedLabel: string
+    deleteLabel: string
+    actions?: ToolbarAction[]
+    busyAction?: string | null
+  }>(),
+  { actions: () => [], busyAction: null },
+)
+const emit = defineEmits<{ 'update:search': [value: string]; delete: []; action: [name: string] }>()
+
+const labels = computed(() => new Map(props.actions.map((action) => [action.name, action.label])))
 </script>
 
 <template>
@@ -52,6 +64,17 @@ const emit = defineEmits<{ 'update:search': [value: string]; delete: [] }>()
         >
           {{ deleteLabel }}
         </Button>
+        <Button
+          v-else-if="labels.has(button)"
+          variant="outline"
+          size="md"
+          :data-action="button"
+          :disabled="busyAction === button"
+          :aria-busy="busyAction === button ? 'true' : undefined"
+          @click="emit('action', button)"
+        >
+          {{ labels.get(button) }}
+        </Button>
       </template>
     </div>
   </div>