chore(docs): patch Astro SVGO advisory

[kattsushi]

Closes #162

Summary

• Resolve Astro's SVGO dependency to patched 4.0.2 through a scoped pnpm override.
• Remove one high-severity docs build advisory without upgrading Astro or unrelated SVGO consumers.
• Reduce the repository audit from 89 to 88 findings.

Changes

File	Change
package.json	Add scoped astro>svgo override.
pnpm-lock.yaml	Replace only Astro's SVGO 4.0.1 resolution with 4.0.2.

Type

• Bug fix
• New feature
• Documentation only
• Code refactoring
• Maintenance/tooling
• Breaking change

Test plan

• Frozen installation passed without peer warnings.
• Audit delta: 89 → 88 (−1 high).
• Docs lint passed.
• Fresh docs build generated all 53 pages.
• Astro remains at 7.2.4; unrelated SVGO 3.3.3 remains unchanged.

Notes

• Docs typecheck remains an existing no-op because its referenced tsconfig uses noEmit: true.
• The unrelated Nx/SVGR SVGO advisory remains a separate work unit.

Contributor checklist

• Linked approved issue chore(docs): patch Astro SVGO advisory #162.
• Selected exactly one PR type (type:chore).
• No shell scripts were modified; shellcheck is not applicable.
• Commit uses Conventional Commit format.
• Commit contains no Co-Authored-By trailer.

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