fix(web): queued messages no longer split the composer notice stack

[tristanmanchester]

With a notice (for example "Server update available") stacked behind the tasks row, queuing a message split the stack. The queue rendered above the whole ComposerBannerStack, so the stack's peek tab landed between the queue and the tasks row as an empty sliver. Hovering it opened the notice in the middle of the column.

ComposerBannerStack now takes the queue through an attachedAbove slot. It renders the peek and expanded notices first, then the queue, then the front row, all as siblings in the banner column. The queue and the tasks row stay attached through the existing adjacent-attachment seam, and the notices peek from the top of the column. Without a queue, or without stacked notices, the output is unchanged.

One side effect: the stack is keyed by thread, so the queue's collapsed/expanded toggle now resets when you switch threads, the same as the notices. It used to carry over from the previous thread.

I tested this against a real Codex turn with a task list, a queued message, and a server version mismatch (client built with a newer APP_VERSION).

	Collapsed	Hovering the peek
Before
After

Removing the queued message leaves the original notice-behind-tasks layout. ComposerBannerStack.test.tsx, lint on both files, and the web typecheck pass.

Model: Claude Opus 5.5 (1M context). Harness: Claude Code in T3 Code.

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Approvability

Verdict: Approved at 6f5f182

Macroscope's review found this PR approvable — This is a contained composer-layout fix that reorders existing banner and queue elements without changing queue operations, data contracts, or production infrastructure. Its only notable behavior change is resetting the queue toggle when switching threads, which is consistent with the keyed notice stack.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6f5f182 and b41d1a9.

📒 Files selected for processing (1)

• apps/web/src/components/chat/ComposerBannerStack.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• apps/web/src/components/chat/ComposerBannerStack.tsx

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📝 Walkthrough

Walkthrough

ComposerBannerStack accepts optional content to render before its front banner. ChatComposer passes queuedRunsControl through this prop.

Changes

Composer banner ordering

Layer / File(s)	Summary
Render attached content with the banner stack apps/web/src/components/chat/ComposerBannerStack.tsx, apps/web/src/components/chat/ChatComposer.tsx	ComposerBannerStack accepts optional attachedAbove content and returns it when no front item exists. Stacked notices render before this content, followed by the front banner attachment. ChatComposer passes queuedRunsControl through attachedAbove.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to b41d1

The queue and banners appear to follow the intended layout, including when there is no front banner. No issue identified here needs to block merging.

Security Architecture Review

Security architecture risk: ⚪ Minimal · up to 6f5f1

The change primarily adjusts composer layout. Queue controls can reset when threads or banner presence change, but their commands retain the same thread and environment scope and server-side state checks. No material security risk was identified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The traced change affects controls for the same selected environment, thread and queued runs. It introduces no additional command source, identity field or privileged operation in this path.

Trust Boundaries and Controls

• observed — Server dispatch runs under a thread-specific lock. Promotion and cancellation reject runs that are no longer queued; reordering validates queue membership and targets and preserves automatic-completion ordering. These existing checks are counterevidence to treating reset UI guards as an authoritative control bypass. They are not a blanket guarantee of idempotency across all failures.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the fix: queued messages no longer split the composer notice stack.
Description check	✅ Passed	The description explains the problem, change, and thread-switch behavior. It includes UI screenshots and focused verification results. It does not explicitly link maintainer approval or explain why th…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
Review comments at @apps/web/src/components/chat/ComposerBannerStack.tsx:
- Line 91: Keep QueuedRunsControl at the same child position in
ComposerBannerStack for both empty and nonempty banner states. Update the return
logic so it always uses the same fragment structure, preserving the existing
banner rendering behavior.

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• Configuration used: Path: .coderabbit.config.ts
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📥 Commits

Reviewing files that changed from the base of the PR and between 76d3c96 and 6f5f182.

📒 Files selected for processing (2)

• apps/web/src/components/chat/ChatComposer.tsx
• apps/web/src/components/chat/ComposerBannerStack.tsx

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