Add Navigation Key Commands, and Asterisk to ID files that have been edited but not saved

### Description

I like this coding app tremendously, but a few quality of life improvements that I have noticed and would like to recommend.

1. Navigation: Would it be possible to add the ability to move between open files using command+option+left or right arrow to switch tabs, much like a browser.
2. Identify Unsaved File: Would it be possible to add an asterisk (*) to the end of the file name in the tab to indicate that is has been changed but not yet saved? Helpful for knowing what has been edited and needs to be saved.
3. Disable Mac Auto-text: Would it be possible to disable, or provide a checkbox/option to disable, the auto text inherent on a mac? Such as adding a period after double spacing and other things? This has been annoying while coding.

Thank you!
~Agnapot

### Alternatives Considered

_No response_

### Additional Context

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### Screenshots

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ファイル、テスト、エントリーポイントは特定されていません。まず、これら3つのリクエストを個別のIssueに分けるべきかを明確にし、次にタブナビゲーション、ファイルタブのタイトルまたは未保存状態の処理、macOSのテキスト入力設定を特定してください。選択した各リクエストについて、動作とテストに合意できれば完了です。

索引モデルが issue の本文から書いたものです。