✨ macOS 26 Tahoe App Icon

### Description

As of macOS 26 Tahoe, app icons are supposed to be [closed squares, which will then be clipped by the system](https://developer.apple.com/design/human-interface-guidelines/app-icons#:~:text=In%20iOS%2C%20iPadOS%2C%20and%20macOS%2C%20icons%20are%20square%2C%20and%20the%20system%20applies%20masking%20to%20produce%20rounded%20corners%20that%20precisely%20match%20the%20curvature%20of%20other%20rounded%20interface%20elements%20throughout%20the%20system%20and%20the%20bezel%20of%20the%20physical%20device%20itself.).

Opinions aside, CodeEdit looks really ugly in Squircle Jail.

Since CodeEdit's app icon is very similar to the icon used in Xcode 16, updating it for the upcoming design using inspiration from the new Xcode app icon would make sense.

### Alternatives Considered

_No response_

### Additional Context

_No response_

### Screenshots

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