chore(ci): align runtime on Node 24 LTS

[kattsushi]

Closes #158

Summary

• Pin GitHub Actions and local runtime selection to Node 24.19.0 LTS.
• Preserve the published Node >=22.22 consumer compatibility floor.
• Keep dependencies and the lockfile unchanged.

Changes

Area	Change
.github/workflows/*.yml	Update all seven setup-node pins to 24.19.0.
.node-version	Add the exact local Node LTS selection.
docs/react-router-latest-major-support.md	Record the new CI runtime.

Type

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

Test plan

• Frozen installation passed under Node 24.19.0 with pnpm 10.14.0.
• Nx graph generated and enumerated 21 projects.
• Workflow YAML and changed-file formatting passed.
• Lint passed for 21 projects.
• Typecheck passed for 19 projects and dependency targets.
• Build passed for 17 projects, including the 53-page docs build.
• All 272 tests passed.
• package.json and pnpm-lock.yaml are unchanged.

Contributor checklist

• Linked approved issue chore(ci): align runtime on Node 24 LTS #158.
• 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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