chore(deps): update dependency @types/node to v26.6.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@types/node (source)	26.6.3 → 26.6.4

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[happy-haki]

Daily maintainer merge (2026-10-06) — low-risk exception before 7-day hold:

• Publish age: @types/node@26.6.4 published 2026-10-01T22:39Z (4.5 days). Merged under the documented low-risk exception.
• Exception rationale: patch-level bump of a types-only devDependency; diff isolated to @types/node version strings in package.json/pnpm-lock.yaml (peer-resolution strings of next/shiki only); no runtime behavior, API, config, schema, or build-tool change; no meaningful transitive risk.
• CI: Netlify header/redirect rules ✅, Deploy Preview ready ✅ (labeler run cancelled by rebase race — non-functional check, reran clean on other PRs).
• Local gates: pnpm install --frozen-lockfile ✅, pnpm lint (ultracite, 65 files clean) ✅, pnpm build ✅.

Merging as maintainer (squash, admin override of review rule). cc @happy-haki