nix-diff seems to prepend 'daemon' before paths to the nix store

Hi there,

while experimenting in the last few days nix-diff started behaving strangely, and started outputting errors like this:

```shell
❯ nix-diff /run/current-system /nix/store/l2h9ciy4ynxp1vklgvqaizzmfp52pff7-darwin-system-25.05.349a74c --color always
nix-diff: daemon/nix/store/bqh2p1bc7kbswp0ip3agibm3irll984y-darwin-system-25.05.349a74c.drv: withBinaryFile: does not exist (No such file or directory)
❯ ll /nix/store/bqh2p1bc7kbswp0ip3agibm3irll984y-darwin-system-25.05.349a74c.drv
Permissions Size User Date Modified Name
.r--r--r-- 38k root 1 Jan 1970 /nix/store/bqh2p1bc7kbswp0ip3agibm3irll984y-darwin-system-25.05.349a74c.drv
```

Is this something I have configured wrong and need to change or is this somehow a bug in nix-diff that it prepends `daemon` to that path before trying to read it?