✨ Improve textfield behavior in Project Navigator

[dscyrescotti]

Description

I would like to suggest a few things for the enhancement of textfield in Project Navigator.

1. When renaming the filename in Project Navigator, the textfield should highlight only filename excluding file extension (let's say to edit a file called HelloWorld.swift, the selection should be applied only on HelloWorld) like Xcode so that it is easy to edit filename without touching extension part.
2. While editing the filename, the background of textfield turns to blue and it looks like textfield is highlighted. The ideal behavior is that textfield should use NSColor.textBackgroundColor so that it will easy to read the filename editing.

I attached screencast below. Please refer to it.

Alternatives Considered

No response

Additional Context

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Screenshots

https://github.com/CodeEditApp/CodeEdit/assets/67727096/e0c0aef7-37d4-4c38-bd99-a0860215596d