fix: sequence diagram support via mermaid/svgdom upgrade

[pilat]

Fixes sequence diagram rendering by upgrading dependencies instead of the broken polyfill approach.

What changed:

• Removed the CSSStyleDeclaration polyfill that was causing broken renders (missing lifelines, stroke="none")
• mermaid 11.12 → 11.14 (sequence renderer fixes)
• svgdom 0.1.22 → 0.1.23 (native removeProperty support)
• Removed unnecessary npm install -g npm@latest from publish workflow (Node 22's npm already supports OIDC provenance)

Result: Sequence diagrams now render correctly with full lifelines and arrows.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 994e16f3-d1f6-43e1-82cc-dd0dcb4657b2

📥 Commits

Reviewing files that changed from the base of the PR and between d0fb8b3 and e4454e0.

📒 Files selected for processing (5)

• .github/workflows/publish.yml
• CHANGELOG.md
• src/mermaid/render.ts
• src/mermaid/style-polyfill.ts
• test/mermaid-elk.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/sequence-diagram-proper

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