fix(vscode): reword the sign-in waiting message to authentication

[wbxl2000]

Related Issue

No linked issue — tiny wording tweak requested by maintainers.

Problem

The sign-in pending screen reads "Waiting for authorization..."; "authentication" is the preferred wording for this UI.

What changed

• Reworded the login pending state in the extension webview to "Waiting for authentication..." — copy only, no behavior change.
• Out of scope (same phrase elsewhere, can be aligned separately if wanted): the CLI login flow, the TUI login spinner, and the kimi-web English locale.

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.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8d1ac3c

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

This PR includes changesets to release 1 package

Name	Type
kimi-code	Patch

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[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@8d1ac3c

npx https://pkg.pr.new/@moonshot-ai/kimi-code@8d1ac3c

commit: 8d1ac3c