feat: add tray icon

[nmggithub]

What Changed

This PR adds a Tray icon to T3 Code on macOS. Currently it has no menu, but I plan to add one. I want to make it like Cursor where you can see your active threads and if any have unread messages and/or are awaiting input.

Why

A tray icon may be useful for interacting with / observing the status of the application.

UI Changes

Checklist

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

Note

Add macOS tray icon using the T3 wordmark SVG

• Adds tray.ts with a createTray factory that renders the T3 wordmark SVG to a multi-scale PNG template image via sharp and creates an Electron Tray on macOS; returns null on other platforms.
• Wires tray creation into the app bootstrap sequence in main.ts and destroys the tray on before-quit.
• Behavioral Change: sharp is now a runtime dependency, adding a native module to the desktop build.

^{Macroscope summarized a43fcef. (Automatic summaries will resume when PR exits draft mode or review begins).}

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[zortos293]

Looks clean ❤️

[Noojuno]

Please make this optional whatever you do! I don't need more icons in my menu bar 🙃

[nmggithub]

Please make this optional whatever you do! I don't need more icons in my menu bar 🙃

Yeah, definitely planning on making it configurable. This is just a first draft.

[Ymit24]

I like this idea, i bet there are some cool interactions that could be added to that tray feature!

[nmggithub]

Threads are now accessible in the menu on macOS, and the icon will inform you when there is an unread thread. Performance isn't exactly great right now, but this is still a draft.

[nmggithub]

@macroscope-app can you take a look at this and let me know your thoughts so far?

EDIT: It seems all Macroscope knows how to do is check the initial PR commit and respond with eyes to comments but not actually follow up.

[nmggithub]

I think I like where this is at at the current moment. Unfortunately, menu item click handlers don't fire all that fast. It looks to be an AppKit issue, so not something we ourselves can entirely solve. Still looking into it, though.