fix: restore advertised nixpkgs flake pin

[Copilot]

What Changed

Aligns the committed Nix lock entry with the value described in the reviewed change. This is scoped to the single review comment about the mismatched flake.lock pin.

• Lockfile pin
  • Restores flake.lock to the advertised nixpkgs revision: a32edd7654519351e48e80372a928df336394670
  • Restores the matching lastModified, narHash, and owner fields so the lock entry is internally consistent

"locked": {
  "owner": "NixOS",
  "repo": "nixpkgs",
  "rev": "a32edd7654519351e48e80372a928df336394670",
  "narHash": "sha256-RjR8AyvGlWuw16XRj7C1YDEw4E27ciuyPeB2nDMzgTU="
}

Why

The repository state no longer matched what the PR claimed was committed. Restoring the exact advertised lock entry makes the pinned toolchain accurate again and resolves the review feedback without changing any unrelated code or behavior.

UI Changes

N/A — no UI changes.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

[dasmatus]

lgtm

[Copilot]

Copilot wasn't able to review any files in this pull request.

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