feat: macOS-style rounded app icon, generated like constructive-desktop

[pyramation]

Summary

The icon looked square because it was full-bleed art. constructive-desktop rounds theirs by clipping the art to the standard macOS tile inside the SVG itself — <clipPath><rect x=100 y=100 width=824 height=824 rx=185/></clipPath> on a transparent 1024 canvas — then regenerating the raster formats from it.

Same setup here: resources/icon.svg now wraps the cube art in that clip, and a new pnpm icons script (scripts/generate-icons.mjs, sharp + png2icons — the exact script constructive-desktop uses) regenerates resources/icon.{png,icns,ico}. The .icns/.ico are new, ready for future packaging.

Link to Devin session: https://app.devin.ai/sessions/04636534e07048089ffb6b78142e12cd
Requested by: @pyramation

[devin-ai-integration]

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	png2icons@​2.0.1
	sharp@​0.35.3

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