fix(web): refine goal mode controls

[chengluyu]

Related Issue

No linked issue. This PR addresses the goal-mode web UI issues found during local testing.

Problem

The goal strip had several inconsistent states: it always reserved space for a budget indicator, its expand/collapse interaction needed smoother transitions, and cancellation used a bespoke confirmation surface outside the design system. The goal controls also needed clearer status and budget presentation.

What changed

• Added animated expand/collapse behavior for the goal strip.
• Made the budget progress indicator conditional on a configured token budget.
• Refined goal strip and composer corner styling, spacing, iconography, and shadows.
• Replaced the bespoke cancellation popover with the shared design-system confirmation dialog.
• Added localized cancellation labels and documented the web goal controls in English and Chinese.
• Added a patch changeset for the bundled CLI release.

Validation

• Web tests: 28 files, 497 tests passed
• Web typecheck passed
• Web design-system style check passed in baseline mode
• Documentation build passed
• Read-only public-identifier audit passed

Checklist

• I have read the CONTRIBUTING document.
• I have explained the problem above.
• I have added tests that prove my feature works.
• Ran the gen-changesets skill.
• Ran the gen-docs skill; the declared changelog sync script is not present in this checkout, so no changelog sync was needed or performed.

[changeset-bot]

🦋 Changeset detected

Latest commit: f91efa7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

Not sure what this means? Click here to learn what changesets are.

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[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@f91efa7

npx https://pkg.pr.new/@moonshot-ai/kimi-code@f91efa7

commit: f91efa7

[chatgpt-codex-connector]

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