Upgrade prettier to 3.9.5 and reformat

[jonnalley]

What changed

Upgrades prettier 3.8.5 → 3.9.5 in the frontend and applies the single reformat the new version produces, so the Linting CI job passes on that upgrade.

• frontend/package.json — bump prettier devDependency to 3.9.5.
• frontend/bun.lock — regenerated lockfile entry for prettier@3.9.5 (new sha512).
• frontend/src/types/ProcurementTrackerTypes.d.ts — prettier 3.9.5 reformats the ProcurementTrackerStepType union onto a single line (whitespace-only; no type or runtime change).

Why a new branch instead of fixing the Renovate PR

Renovate PR #5873 (chore(deps): update minor dependencies, branch renovate/all-minor) batches this same prettier bump, and its Linting job fails on exactly this file:

[warn] src/types/ProcurementTrackerTypes.d.ts
[warn] Code style issues found in the above file. Run Prettier with --write to fix.
error: "prettier" exited with code 1

Renovate treats its branches as managed and will overwrite/abandon them if others push commits, so we deliberately do not push the format fix onto renovate/all-minor. Instead this self-contained branch carries the prettier bump + lockfile + reformat on its own and can merge into main independently. Once merged, Renovate will drop prettier from its next batch.

Issue

N/A — maintenance follow-up to Renovate PR #5873. No dedicated ticket.

How to test

cd frontend
bun install
# Mirrors the failing CI step — should exit 0:
bun run prettier --check --ignore-unknown 'src/**/*' '!src/uswds/**'
# Should be clean:
bun run lint

Both were verified locally: prettier --check prints "All matched files use Prettier code style!" and eslint exits 0.

A11y impact

• No accessibility-impacting changes in this PR

Storybook

• N/A — change is page-specific or non-visual

Screenshots

N/A — dependency + formatting change only.

Definition of Done Checklist

• OESA: Code refactored for clarity
• OESA: Dependency rules followed
• Automated unit tests updated and passed
• Automated integration tests updated and passed
• Automated quality tests updated and passed
• Automated load tests updated and passed
• Automated a11y tests updated and passed
• Automated security tests updated and passed
• 90%+ Code coverage achieved
• Form validations updated

Links

• Supersedes the prettier portion of Renovate PR chore(deps): update minor dependencies #5873

[github-actions]

🎉 This PR is included in version 1.428.0 🎉

The release is available on GitHub release

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