`R2Bucket.list()` returns keys that contain non-ASCII characters or `%` in percent-encoded form. A `get()` with the listed key returns `null`. ASCII keys, including keys with spaces, list unchanged, and `get()` with the original key works.

### Reproduction

`wrangler.jsonc`:

```jsonc { "name": "r2-list-repro", "main": "index.js", "compatibility_date": "2026-01-01", "r2_buckets": [{ "binding": "FILES", "bucket_name": "files" }] } ```

`index.js`:

```js export default { async fetch(request, env) { const keys = ["přehled.html", "plain.html", "with space.html", "100%.html"]; for (const key of keys) await env.FILES.put(key, "hello"); const listed = (await env.FILES.list()).objects.map((o) => o.key); const results = []; for (const key of listed) results.push({ listed: key, getWorks: (await env.FILES.get(key)) !== null }); return Response.json(results); }, }; ```

### Result

A node with `--bucket s3://…` against MinIO `RELEASE.2025-04-22T22-12-26Z`, celld 0.5.1:

```json [ {"listed": "100%25.html", "getWorks": false}, {"listed": "p%C5%99ehled.html", "getWorks": false}, {"listed": "plain.html", "getWorks": true}, {"listed": "with space.html", "getWorks": true} ] ```

The bucket holds the objects as `r2/files/p%C5%99ehled.html` and `r2/files/100%25.html`. `list()` seems to return the stored name without reversing the encoding that `put()` applies.

`celld dev`, 0.5.0 and 0.5.1, adds a second layer: `p%25C5%2599ehled.html` and `100%2525.html`.

### Expected

`list()` returns `přehled.html` and `100%.html`, the keys passed to `put()`, as Cloudflare R2 does.

### Environment

celld 0.5.0 and 0.5.1, `aarch64-apple-darwin` build, both `celld dev` and a node on an S3 bucket in MinIO `RELEASE.2025-04-22T22-12-26Z`.