Rename empty orchestration environment label

[cephalonaut]

Description

Rename the shared orchestration empty-environment picker entry from (no environment) to Empty environment so the run agents card and plan card match the Oz web wording.

Testing

• cargo fmt --manifest-path /workspace/warp/Cargo.toml --all

• cargo test --manifest-path /workspace/warp/app/Cargo.toml --lib orchestration_controls

• cargo clippy --manifest-path /workspace/warp/app/Cargo.toml --lib --all-features --tests -- -D warnings (fails on existing warpui_core clippy errors unrelated to this change)

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

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

CHANGELOG-NONE

Co-Authored-By: Oz oz-agent@warp.dev

Conversation: https://staging.warp.dev/conversation/da7a0d5a-8778-4d14-8754-18c944c83617
Run: https://oz.staging.warp.dev/runs/019e4149-eb76-73e5-b8ea-9de14de7e8cd

This PR was generated with Oz.

[oz-for-oss]

@cephalonaut

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[oz-for-oss]

Overview

This PR renames the empty orchestration environment picker label from (no environment) to Empty environment, affecting the shared picker used by orchestration controls.

Concerns

• This is a user-facing copy change, but the PR description does not include screenshots or a screen recording showing the updated picker label end to end in the affected surfaces.
• No security findings.
• No approved or repository spec context was available for comparison.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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[oz-for-oss]

⚠️ [IMPORTANT] For this user-facing change, please include screenshots or a screen recording demonstrating the updated empty-environment option in the affected orchestration picker surfaces end to end.