Remove sharp from SVG snapshot matching

[seveibar]

Summary

• replace the looks-same@9/bun-match-svg peer dependency chain with @tscircuit/image-utils
• declare both @tscircuit/image-utils and @resvg/resvg-js as unpinned "*" peers, with resvg pinned only for local development
• rasterize SVGs with resvg before comparing PNG pixels
• write returned diff buffers explicitly and fix the existing PNG snapshot helper
• remove legacy peer-install instructions

This prevents graphics-debug consumers, including @tscircuit/core, from auto-installing sharp@0.32.6.

Verification

• bun test (65 pass)
• bunx tsc --noEmit
• bun run build
• confirmed no sharp, looks-same, or bun-match-svg entries remain in package.json or bun.lock

[vercel]

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Project	Deployment	Actions	Updated (UTC)
graphics-debug	Ready	Preview	Aug 7, 2026 9:48pm

[tscircuitbot]

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Impact: Major

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