WXT Auto Icons - linearGradient support

Describe the bug

My icon rendered as black & white so I asked Gemini 3.1 Pro & it gave me this:

The issue is that @wxt-dev/auto-icons uses a basic SVG-to-PNG rasterizer under the hood that likely doesn't support linearGradient elements properly — it strips them out and renders everything as black/white fallback fills.

Reproduction

1. Use the SVG below
2. And run @wxt/auto-icons to see black & white colors

<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <linearGradient id="bgGrad1" x1="0%" y1="0%" x2="100%" y2="100%">
      <stop offset="0%" stop-color="#E2FF00"/>
      <stop offset="100%" stop-color="#FFB800"/>
    </linearGradient>
    <linearGradient id="arrowGrad1" x1="0%" y1="0%" x2="0%" y2="100%">
      <stop offset="0%" stop-color="#2A0845"/>
      <stop offset="100%" stop-color="#6441A5"/>
    </linearGradient>
  </defs>

  <rect width="100" height="100" rx="22" fill="url(#bgGrad1)" />

  <path d="M 15 70 A 35 12 0 0 1 85 70" stroke="#FF0055" stroke-width="3" fill="none" opacity="0.4" />

  <path d="M 42 15 L 58 15 L 58 50 L 72 50 L 50 85 L 28 50 L 42 50 Z" fill="url(#arrowGrad1)" />
  
  <path d="M 50 20 L 50 45" stroke="#E2FF00" stroke-width="2" stroke-linecap="round" opacity="0.4" />
  <polygon points="50,58 54,52 46,52" fill="#E2FF00" opacity="0.6" />

  <line x1="25" y1="20" x2="25" y2="35" stroke="#FF0055" stroke-width="2" stroke-linecap="round" opacity="0.8"/>
  <line x1="75" y1="25" x2="75" y2="40" stroke="#6441A5" stroke-width="2" stroke-linecap="round" opacity="0.8"/>
  <line x1="50" y1="5" x2="50" y2="10" stroke="#FF0055" stroke-width="2" stroke-linecap="round" opacity="0.8"/>

  <path d="M 15 70 A 35 12 0 0 0 85 70" stroke="#FF0055" stroke-width="10" fill="none" stroke-linecap="round" opacity="0.3" />
  <path d="M 15 70 A 35 12 0 0 0 85 70" stroke="#FF0055" stroke-width="3" fill="none" stroke-linecap="round" />
</svg>

Steps to reproduce

No response

System Info

-

Used Package Manager

pnpm

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.