`vp migrate` fails on single-line `.oxfmtrc.json` with a final newline

[TheAlexLichter]

Describe the bug

vp migrate exits with a YAML parse error when .oxfmtrc.json contains valid single-line JSON ending in LF or CRLF.
The identical JSON without a final newline migrates successfully.

Pretty-printing it across multiple lines also succeeds, including with a final newline.

Reproduction

https://github.com/TheAlexLichter/vite-plus-reproduction/tree/migrate-oxfmt-trailing-newline

Steps to reproduce

• git clone --single-branch --branch migrate-oxfmt-trailing-newline https://github.com/TheAlexLichter/vite-plus-reproduction.git
• cd vite-plus-reproduction
• node reproduce.mjs

See README of the branch for more details as necessary.

System Info

Vite+ CLI: 0.3.0
Initial project Vite: 8.2.2
Node: 24.21.0
pnpm: 12.3.4
OS: macOS arm64
No local Vite+ installation before migration

Used Package Manager

pnpm

Logs

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue for the same bug.
• Confirm this is a Vite+ issue and not an upstream issue (Vite, Vitest, tsdown, Rolldown, or Oxc).
• The provided reproduction is a minimal reproducible example.