Add Cloudflare Pages placeholder index.html

[0suu]

Summary

• add a root-level index.html so Cloudflare Pages can serve a PR preview
• provide a placeholder layout explaining that the preview is UI-only without SwitchBot API or Electron calls

Testing

• not run (static content only)

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Codex Task

[gemini-code-assist]

Summary of Changes

Hello @0suu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

このプルリクエストは、Cloudflare Pages上でのPull Requestプレビュー機能を有効にするために、ルートディレクトリにindex.htmlファイルを追加します。これにより、開発者はUIの変更をブラウザで手軽に共有・レビューできるようになります。このプレースホルダーページは、実際のAPI呼び出しやElectron固有の機能なしに、UIのスタイル、コンポーネントの見た目、ルーティング、状態管理のモック挙動などを確認することを目的としています。

Highlights

• Cloudflare Pagesプレビューの追加: Pull RequestごとにUIの挙動を確認するためのindex.htmlファイルがルートレベルに追加されました。
• UI専用プレースホルダー: このプレビューはUIの見た目やモック挙動の確認に特化しており、SwitchBot APIやElectronへの実際の呼び出しは行いません。

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[gemini-code-assist]

Code Review

This pull request introduces a placeholder index.html file for Cloudflare Pages previews. The implementation is well-done, using a single static file with modern CSS. The content clearly communicates the purpose of the preview environment. I have one suggestion to improve the semantic correctness of the CSS.

[gemini-code-assist]

The color-scheme property is set to light dark, which signals that the page supports both light and dark modes. Since the CSS only provides a dark theme, this could lead to minor UI inconsistencies (e.g., for scrollbars) on systems with a light mode preference. To accurately reflect the page's styling, it's recommended to set this property to dark.

Suggested change

	color-scheme: light dark;
	color-scheme: dark;