fix(update): refresh target before foreground prompts

[liruifengv]

Related Issue

No linked issue; this fixes foreground update prompts showing a stale cached target version.

Problem

Startup preflight could read an older cached latest version, then refresh the cache in the background. When automatic background installs were not used and a foreground prompt or manual command was shown, the UI could display the cached version even though a newer version was available from the fresh check.

What changed

• Refresh the user-visible update target before rendering foreground update prompts or manual update commands.
• Keep automatic background install startup behavior non-blocking.
• Add a regression test for stale cached targets so the prompt, install command, actual install, and success message all use the refreshed version.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

Validation

• pnpm exec vitest run apps/kimi-code/test/cli/update/preflight.test.ts
• pnpm --filter @moonshot-ai/kimi-code run typecheck
• pnpm exec oxlint --type-aware apps/kimi-code/src/cli/update/preflight.ts apps/kimi-code/test/cli/update/preflight.test.ts
• git diff --check

[changeset-bot]

🦋 Changeset detected

Latest commit: 54f18a8

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

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[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@54f18a8

npx https://pkg.pr.new/@moonshot-ai/kimi-code@54f18a8

commit: 54f18a8

[chatgpt-codex-connector]

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Reviewed commit: 54f18a8b65

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