fix(web): composer banner titles truncate beside their icon instead of wrapping

[maria-rcks]

Since #17640, a composer banner whose title is wider than the row splits into three lines. The icon sits alone, the title goes on the next line, and the actions go below that. You can see it on the background-work banner, for example "Running: Remove stale host key and rerun typecheck" with Stop. #17640 switched the wrap-actions row to flex flex-wrap. The content is whitespace-nowrap, so its flex basis is the full title width, and when that doesn't fit next to the icon it wraps onto a new line.

The fix caps the content's width at the row width minus the icon column and the gap. The title now always shares the first line with the icon and truncates there. Actions still stay inline while everything fits and move to a second line otherwise, which is the behavior #17640 intended.

Before (390px, real background task on the current main):

After:

At 1280px the same banner stays on one line, with the title and Stop inline.

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[macroscopeapp]

Approvability

Verdict: Approved at a1c07de

Macroscope's review found this PR approvable — This is a small, self-contained UI fix that constrains existing composer banner content so long titles truncate beside their icon while action wrapping remains unchanged. It introduces no schema, infrastructure, security, billing, default, or static-analysis changes.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The composer banner now limits the width of wrapped action content to the space beside the icon. The content retains flex growth.

Changes

Composer banner layout

Layer / File(s)	Summary
Wrapped action content width apps/web/src/components/chat/ComposerBanner.tsx	For wrap-actions, the content now has a maximum width based on the row width, icon column, and spacing. It retains flex growth.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: juliusmarminge

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Merge Risk: 🔵 Low · up to 8db49

A long banner title may push an action onto another line even when both could fit. This is a localized layout issue; adjust the content sizing as a follow-up.

Pre-merge checks | 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary fix: composer banner titles truncate beside their icon instead of wrapping.
Description check		The description clearly explains the problem, the CSS change, expected behavior, responsive behavior, visual verification, screenshots, and the agent used. It does not include a separate scope and app…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @apps/web/src/components/chat/ComposerBanner.tsx:
- Around line 204-206: Update the `wrap-actions` layout class in
`ComposerBanner` to give `composer-banner-content` a zero flex basis before it
grows, so the content takes the space remaining after actions fit. Remove the
max-width constraint that interferes with flex line formation.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between a1c07de and 8db49a9.

📒 Files selected for processing (1)

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

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