fix(kimi-web): ignore non-string markdown copy payloads

[arimu1]

Related Issue

Resolve #1812

Problem

See linked issue. Copying a code block in kimi web could put the literal string [object ClipboardEvent] on the clipboard.

What changed

• Added asCopyableText() to accept only non-empty string copy payloads
• Markdown.vue copyCodeBlockFallback now ignores non-string @copy payloads (for example a native ClipboardEvent) before the HTTP clipboard fallback runs
• Unit tests for asCopyableText
• Patch changeset for the CLI bundle that ships the web UI

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.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 53fac0e

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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[arimu1]

Closing this — the fix landed independently in #2120.

copyCodeBlockFallback now lives in apps/kimi-web/src/lib/clipboard.ts on main and opens with exactly the guard this PR was adding:

export function copyCodeBlockFallback(payload: unknown): void {
  if (typeof payload !== 'string') return;
  ...
}

with test/clipboard.test.ts covering it via { toString: () => '[object ClipboardEvent]' }. That's the whole substance of this PR, so rebasing would leave only a cosmetic difference. Thanks for the look regardless.