Add orchestration create environment modal

[kjankov]

Description

Adds a “New environment” entry point to orchestration environment pickers and opens a create-environment modal based on the Agent orchestration design.

This includes:

• A reusable orchestration create-environment modal that creates the environment and selects it in the originating orchestration config.
• Orchestration-specific copy/layout for the existing environment form, including compact modal spacing and footer actions.
• Deferred GitHub repo loading when the modal opens.
• Graceful GitHub repo load-error fallback so users can still paste repo URLs and retry repo discovery.

Linked Issue

QUALITY-624

• 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

• cargo fmt -- --check

• cargo clippy --workspace --exclude warp_completer --all-targets --tests -- -D warnings

• cargo clippy -p warp_completer --all-targets --tests -- -D warnings

• cargo check --manifest-path /Users/katarina/.warp/worktrees/warp/sagebrush-adobe/Cargo.toml -p warp --lib

• cargo test --manifest-path /Users/katarina/.warp/worktrees/warp/sagebrush-adobe/Cargo.toml -p warp update_environment_form --lib

• cargo test --manifest-path /Users/katarina/.warp/worktrees/warp/sagebrush-adobe/Cargo.toml -p warp run_agents_card_view --lib

• cargo test --manifest-path /Users/katarina/.warp/worktrees/warp/sagebrush-adobe/Cargo.toml -p warp orchestration_modal --lib

• git --no-pager diff --check

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

Screenshots / Videos

Not included.

Agent Mode

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

Agent Artifacts

• Conversation: https://app.warp.dev/conversation/55a7895a-b680-463d-ac6d-ce30c27769b1
• Plan: https://app.warp.dev/drive/notebook/rUQ8mlTKgGjFmTLUN2jOC4

Changelog Entries for Stable

CHANGELOG-IMPROVEMENT: Added a create-environment flow to the orchestration environment picker.

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

[oz-for-oss]

@kjankov

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[oz-for-oss]

Overview

This PR adds a new orchestration environment creation entry point, a reusable create-environment modal, deferred GitHub repo loading, and related environment form configuration for orchestration surfaces.

Concerns

• This is a user-facing UI/layout change, but the PR description says screenshots/videos are not included and manual testing is unchecked. For this user-facing change, please include screenshots or a short screen recording demonstrating the environment picker entry point, modal creation flow, and post-create selection working end to end.

Verdict

Found: 0 critical, 1 important, 0 suggestions

Request changes

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[cephalonaut]

Also, not sure if its a problem with the modal itself, but the dropdown seems to be semi-transparent in a weird way:

[kjankov]

@cephalonaut yeah i think that's a problem with the modal