Update documentation and Nedi diagrams to Mermaid 12

[ktsaou]

Summary

Use Mermaid 12.0.0 for both documentation diagrams and Nedi, with the version 12 rendering defaults. Update Nedi Markdown-it to 15.0.2 and Viz.js to 3.30.0, including matching CDN integrity hashes.

Chevrotain pins vulnerable lodash-es 4.17.23. A qualified resolution selects 4.18.1 for the local bundle; README documents the exact-pin exception. The immutable Nedi CDN was inspected separately: the implementations affected by GHSA-r5fr-rjxr-66jc and GHSA-f23m-r3pf-42rh are absent from its source map. The local resolution does not modify CDN bytes.

Validation

• Frozen Yarn installation and production build passed.
• Supported Node 22: 478 Vitest tests passed, one skipped; 73 Node tests passed.
• Built Registry and Parents pages rendered six diagrams across light/dark modes without browser exceptions.
• Baseline/candidate audits have identical 168 advisory/path pairs; no introduced findings and no Mermaid/lodash-es findings.
• Old/new Nedi producer and consumer combinations passed browser rendering checks.

The Viz.js update overlaps #3073. This PR includes that asset change but does not change the other PR's status.

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Summary by cubic

Updates documentation and Nedi diagrams to Mermaid 12.0.0 with its new rendering defaults, and bumps @viz-js/viz to 3.30.0 and Nedi's markdown-it to 15.0.2 (with updated CDN integrity hashes). Adds a resolution for lodash-es 4.18.1 to address a vulnerability in Chevrotain (pinned by Mermaid) that only affects the local documentation bundle; the Nedi CDN assets are unaffected.

^{Written for commit e95c436. Summary will update on new commits.}

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Reviewing files that changed from the base of the PR and between 1717211 and e95c436.

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• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (4)

• README.md
• package.json
• src/components/Nedi/assets.js
• tests/dependency_authority.test.js

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