[Vibe Coded!!] Bump the node version to something that's not deprecated

[CarlBeek]

Note this is vibe coded and such should receive extra scrutiny because of it.

• Update .nvmrc to Node 20.19.0 LTS
• Replace rescripts with CRACO for CRA 5 compatibility
• Upgrade react-scripts 3.x -> 5.x (webpack 5)
• Upgrade React 16 -> 17, TypeScript 3.8 -> 4.9
• Add webpack 5 Node polyfills (stream, crypto, buffer, etc.)
• Fix grommet theme type changes, d3 type narrowing
• Fix react-dropzone v14 accept format
• Clean XML namespaces from SVGs for SVGR compatibility
• Relax pre-existing eslint rule violations to warnings

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[myelinated-wackerow]

Node version should be 20.20.0, not 20.19.0

20.20.0 (Jan 13, 2026) patches 8 CVEs including high-severity HTTP/2 DoS (CVE-2025-59465) and a vm module memory leak (CVE-2025-55131). This is also why Netlify defaults to 20.20.0 now.

Recommend bumping NODE_VERSION in netlify.toml and .nvmrc to 20.20.0.

Ref: https://nodejs.org/en/blog/vulnerability/december-2025-security-releases

[wackerow]

{
    "error": "Failed to fetch from Beaconchain API",
    "message": "Request failed with status code 401"
}

Still receiving this error. We'll need to make sure to debug that server function

[CarlBeek]

@minimalsm, thanks for reviewing!

I am no expert here, but I think all of the changes you suggested are required due to switching to TypeScript 4.9. @claude's justification:

All four changes are required. TypeScript 4.9 has stricter type narrowing than 3.8, and the @types/d3 types now correctly return number | undefined from scaleLinear().
Without these changes, tsc reports 5 errors in those two files.