chore: update dependencies to latest versions

- @types/node: 25.8.0 -> 25.9.1
- @vitest/expect: 4.1.6 -> 4.1.7
- @vitest/spy: 4.1.6 -> 4.1.7
- @vitest/utils: 4.1.6 -> 4.1.7
- @vitest/mocker: 4.1.6 -> 4.1.7
- @vitest/pretty-format: 4.1.6 -> 4.1.7
- @vitest/runner: 4.1.6 -> 4.1.7
- @vitest/snapshot: 4.1.6 -> 4.1.7
- katex: 0.16.46 -> 0.16.47
- postcss: 8.5.14 -> 8.5.15
- nanoid: 3.3.11 -> 3.3.12
- vitest: 4.1.6 -> 4.1.7
- Updated related dependencies for consistency.

Author: actions-user