fix: augment #app rather than nuxt/app

[danielroe]

We're seeing some cases where when users augment #app/nuxt rather than #app, they can lose type support once the (future default) typescript module resolution of 'bundler' is enabled.

While searching for repos using that, I also came across this usage (nuxt/app). While it should be fine, I thought it would still be worth raising this PR for you to consider, in case it might prevent issues in future.

related: nuxt/nuxt#24193

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