Unnecessary resolutions in sideEffects: false package

When re-exporting nothing from a package that has sideEffects disabled, I would expect esbuild to discard the export completely. However, it seems to try to resolve all paths within the package unnecessarily.

I think this has a non-trivial performance impact on WASM.

## Reproduction

```ts
export {} from "viem"
```

https://stackblitz.com/edit/stackblitz-starters-b1bwlb?file=index.mjs

Start with the linked StackBlitz reproduction and compare resolution behavior for `export {} from "viem"` when the package has side effects disabled. Trace esbuild's package-resolution path for this empty re-export, then verify that unnecessary paths are no longer resolved and that the WASM reproduction shows the expected performance improvement.

Written by the indexing model from the issue text.