Adopt Node 24 and Biome tooling

[exekias]

Summary

• pin local and CI runtimes to Node 24 LTS and align Node type definitions
• replace ESLint with Biome's formatter, linter, import organization, and Next/React domains
• keep Next.js at the current latest release, 16.3.4, using its built-in Turbopack/SWC toolchain
• move CI actions to their v7 tags and add grouped GitHub Actions Dependabot updates
• apply the Biome baseline formatting and targeted correctness/accessibility fixes

Validation

• Node 24.20.0
• npm run lint
• npm run lessons:validate (43/43)
• tsc --noEmit
• npm run build (Next.js 16.3.4 / Turbopack)
• git diff --check

Audit note

npm audit still reports four moderate development-only esbuild advisories through drizzle-kit and tsx. The offered npm audit fix is a breaking downgrade of drizzle-kit, so this PR leaves those for an upstream-compatible update rather than forcing an unsafe override.

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Project	Deployment	Actions	Updated
learn-postgres	Ready	Preview	Sep 9, 2026 12:21pm UTC