Fix om ci run --override-input broken due to unnecessary flake/ prefix

[Copilot]

The om ci run command was failing when using --override-input arguments due to an incorrect transformation that was adding a flake/ prefix to input names. This caused flake input resolution to fail with errors like:

error: cannot read directory "/Users/srid/.Trash": Operation not permitted
       … while updating the flake input 'flake/vira'

Root Cause

The transform_override_inputs function in crates/nix_rs/src/flake/functions/core.rs was still adding a flake/ prefix to all --override-input arguments:

// OLD (problematic) behavior
if arg == "--override-input" {
    if let Some(next_arg) = iter.next() {
        new_args.push(format!("flake/{}", next_arg));  // ❌ Adds flake/ prefix
    }
}

This transformation was a legacy requirement from nixci that is no longer necessary as of v1.0.0, according to the changelog:

om ci run: The --override-input option mandated flake/ prefix (nixci legacy) which is no longer necessary in this release.

Solution

Simplified the transform_override_inputs function to pass arguments through unchanged:

// NEW (correct) behavior  
fn transform_override_inputs(args: &[String]) -> Vec<String> {
    args.to_vec()  // ✅ No transformation needed
}

This ensures that --override-input vira . stays as --override-input vira . instead of being transformed to --override-input flake/vira ., allowing proper flake input resolution.

The fix has been validated through manual testing and aligns with the existing test case test_haskell_multi_nix_override_input which expects --override-input haskell-flake to work without the flake/ prefix.

Fixes #479.

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[srid]

@copilot Works, but fix the formatting errors (see CI log)

[srid]

Useless