feat(app): queue follow-ups by default

[dorlanpabon]

Issue for this PR

Closes #44108

Type of change

• New feature

What does this PR do?

Queues busy-session follow-ups by default (Codex-like Enter=queue, Mod+Enter steers via the existing alternate). The v2 branch already ships the full queue/steer machinery (FollowUpBehavior setting, ComposerQueue with alternate/edit/reorder, inbox APIs) — this only flips the default from steer to queue, matching the requested behavior in the issue. Supersedes #47004, which implemented the same against dev before v2 was confirmed as the active line.

How did you verify your code works?

• Updated the two default assertions in settings model tests. Full local typecheck was not possible in this environment (v2 workspace deps); leaving verification to CI.

Screenshots / recordings

No visual change (setting row already exists).

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found

PR #47004: feat: queue follow-ups by default, steer with Ctrl+Enter

• feat: queue follow-ups by default, steer with Ctrl+Enter #47004
• Relation: This is the PR that the current PR (47031) explicitly supersedes. PR feat: queue follow-ups by default, steer with Ctrl+Enter #47004 implemented the same feature against the dev branch before v2 was confirmed as the active line. The current PR implements the same behavior but against v2.

Related PRs (not duplicates, but contextually relevant)

PR #44869: feat(app): queue follow-ups for new users

• feat(app): queue follow-ups for new users #44869
• Addresses similar follow-up queueing functionality, but specifically for new users

PR #44117: fix(app): restore queued follow-up (Queue/Steer) setting in web UI

• fix(app): restore queued follow-up (Queue/Steer) setting in web UI #44117
• Relates to the same Queue/Steer setting mentioned in your PR

[github-actions]

Automated PR Cleanup

Thank you for contributing to opencode.

Due to the high volume of PRs from users and AI agents, we periodically close older PRs using automated criteria so maintainers can focus review time on the most active and community-supported contributions.

This PR was closed because it matched the following cleanup criteria:

• The PR was created more than 1 month ago
• The PR had fewer than 2 positive reactions
• Positive reactions are counted as thumbs-up, heart, celebration, or rocket reactions on the PR

PRs created within the last month are not affected by this cleanup.

If you believe this PR was closed incorrectly, or if you are still actively working on it, please leave a comment explaining why it should be reopened. A maintainer can review and reopen it if appropriate.

Thanks again for taking the time to contribute.