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/api/types.ts

@@ -40,6 +40,8 @@ export type AdminActionRequest = Schemas['cabana.AdminActionRequest']
 export type AdminActionResult = Schemas['cabana.AdminActionResult']
 /** A controller's plugin script and stylesheet URLs under {base}/assets/. */
 export type ControllerAssets = Schemas['cabana.ControllerAssets']
+/** A registered toolbar action the admin may run, with its localized label. */
+export type ToolbarAction = Schemas['cabana.ToolbarAction']
 /** One node of a rendered partial: an allowlisted element or a text node. */
 export type PartialNode = Schemas['cabana.PartialNode']
 /** A rendered header or form partial. */