feat(dashboard,admin-vite-plugin): Add product zones and fix zone change effect (#7427)

**What**
- Adds injection zones to the product domain.
- Fixes an issue where changing the `zone` in a widget config to another valid widget would not trigger a HMR event.
- Fixes an issue where UI Routes would not work in production.

packages/admin-next/dashboard/src/module.d.ts

@@ -7,7 +7,7 @@ declare module "virtual:medusa/widgets/*" {
 }
 
 declare module "virtual:medusa/routes/pages" {
-  const pages: { path: string; file: string }[]
+  const pages: { path: string; Component: () => JSX.Element }[]
 
   export default {
     pages,