chore: update prettier to v3

[aidenjbrown]

Summary:

• Updates Prettier from v2.8.8 to v3.8.3.
• Leaves existing formatting unchanged.
• Keeps existing root package.json Prettier config: printWidth 100.
• Keeps existing lint-staged behavior: prettier --write for staged TS/JS/MJS/CJS files.

Important note:
This is not a formatting cleanup PR. It only updates the Prettier dependency. A full Prettier formatting pass was intentionally not run because the repo already has a noisy formatting baseline, and running prettier --write would create a large formatting-only diff.

Verification:

• npx prettier@2.8.8 --check [sample files] showed the same sample files already had formatting issues before Prettier 3.
• npm test -- --watch=false passed:
  • 79 test suites passed
  • 670 tests passed
  • 6 skipped
  • 10 snapshots passed.
• npx prettier --check "packages/**/*.{ts,js,mjs,cjs}" --ignore-path .gitignore still reports existing formatting issues, so no formatting changes were included.

[changeset-bot]

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Latest commit: 5e393e0

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