Vite 7 + friends (#2844)

* vite 7 + friends

* fix typechecking (not sure what changed)

* turn on isolatedModules: true like the vite docs say

https://vite.dev/guide/features.html#isolatedmodules
https://www.typescriptlang.org/tsconfig/#isolatedModules

* let vite handle its own default entrypoint

Author: david-crespo

mock-api/json-type.ts

@@ -6,4 +6,4 @@
  * Copyright Oxide Computer Company
  */
 
-export { Json } from '~/api/__generated__/msw-handlers'
+export { type Json } from '~/api/__generated__/msw-handlers'