feat: add nitro framework icon

[logaretm]

Adds the Nitro framework icon (sourced from https://nitro.build/icon.svg) as javascript-nitro

I made sure to wrap the original 40×40 gradient circle logo in translate + scale so it sits with ~10% padding inside both the 20×20 and 80×80 viewBoxes, to match similar existing icons. I also added a white background rect so the evenodd "N" cutout stays readable on dark UIs.

[Copilot]

Pull request overview

Adds support for the Nitro framework by introducing a new nitro SVG icon (20×20 and 80×80 variants) and wiring it into the platform→icon mapping so it can be rendered via PlatformIcon.

Changes:

• Added nitro.svg icon assets for small (svg/) and large (svg_80x80/) sizes.
• Updated PLATFORM_TO_ICON to map javascript-nitro → nitro.
• Updated src/icons.generated.ts to import and expose the new icon in both icons and iconsLg.

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
svg/nitro.svg	Adds the 20×20 Nitro icon variant with padding/background for UI legibility.
svg_80x80/nitro.svg	Adds the 80×80 Nitro icon variant aligned to the same padding convention.
src/platformIcon.tsx	Registers javascript-nitro so callers can request the Nitro icon via platform string.
src/icons.generated.ts	Includes the new Nitro SVGs in the generated import + icon maps.

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