This reverts commit 547fee0e0e.
BREAKING CHANGE: 547fee previously added auto imports from subdirectories, but Nuxt does not do this, so to be consistent with Nuxt's DX, I'm also removing these auto-imports.
Entrypoint outputs and files in the public directory are typed properly.
Chunks and other generated files are not typed since they aren't often accessed at runtime.
BREAKING CHANGE: `browser` is now imported from `wxt/browser` instead of `webextension-polyfill`
Aaron