Fix Nix build features

[bet4it]

Description

Remove the stale nld_improvements Cargo feature from the Nix package build.

nld_improvements was removed in #10671, but the flake still passed it through buildFeatures. That causes nix run .#warp-terminal-experimental to fail during Cargo feature validation.

Closes #10979.

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

• I have manually tested my changes locally with ./script/run

  Validated locally with nix run .#warp-terminal-experimental

Screenshots / Videos

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[oz-for-oss]

@bet4it

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[oz-for-oss]

@bet4it

Every PR must be linked to a same-repo issue before Oz can review it.

Next step: open or find a same-repo issue describing this change, then link it to this PR by adding Closes #123 to the PR description (or using the "Development" sidebar on GitHub). A maintainer will mark the issue ready-to-implement when it is ready. Once it is marked, comment /oz-review to re-trigger review.

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[bet4it]

/oz-review

[oz-for-oss]

@bet4it

I'm re-reviewing this pull request in response to a review request.

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I reviewed this pull request and requested human review from: @alokedesai.

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[oz-for-oss]

Overview

This PR removes the stale nld_improvements feature from the Nix package build feature list so warp-terminal-experimental no longer passes an unknown Cargo feature.

Concerns

• No blocking correctness, security, or spec-drift concerns found in the attached diff.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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[alokedesai]

@bnavetta Mind taking a look in lieu of me?

[bnavetta]

#11103 is a longer-term fix for this category of issue, but approving this to unblock Nix builds in the meantime - I'd like to take another close pass over that one