Added support for Trae IDE

[lnieuwenhuis]

To make all the tests pass, I had GPT-5.4 go through until they all passed.

What Changed

I have added support for opening files and projects in Trae IDE, along with some type and test changes to make that work.

Why

I actively use Trae IDE for file edit work and coding myself, so I was missing a quick link to Trae, so I added it.

UI Changes

Before

After

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• [n/a] I included a video for animation/interaction changes

Note

Add Trae IDE as a supported editor option

• Adds trae to the EDITORS constant in editor.ts with command trae, and adds launch resolution tests in open.test.ts.
• Adds a TraeIcon SVG component to Icons.tsx and includes Trae as a selectable option in the OpenInPicker editor dropdown in ChatView.tsx.
• Introduces per-editor icon sizing logic so the Trae icon renders slightly larger than other editor icons in both the button and menu surfaces.

^{Macroscope summarized 9819e19.}

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[lnieuwenhuis]

@maria-rcks re-opened with the correct contributing formatting this time I hope. Thanks for the feedback on the last one