feat: Add biome as a formatter

[HouseinIsProgramming]

PR Description

Summary

Migrated from ESLint + Prettier to Biome for faster linting and formatting.

Changes:

• Installed @biomejs/biome (v2.3.8)
• Migrated ESLint config → biome.json (71/310 rules migrated)
• Migrated Prettier config → biome.json + .editorconfig
• Updated package.json scripts: lint, format, added check
• Updated .lintstagedrc.json to use biome check
• Enabled import organization (replaces prettier-plugin-organize-imports)

Performance:

• Format time for entire repo: ~0.5s (was ~9s with Prettier)
• Pre-commit linting and formatting seems instant, where as before it could last a while

Breaking Changes

Probably - Developer setup changes required:

• Install Biome VS Code extension: biomejs.biome
• Note: Import organization works differently (Biome's native sorter vs TypeScript language service)
• Excluded from formatting: Angular files (admin-ui/**), GraphQL files (**/*.graphql)

📌 Always:

• I have set a clear title
• My PR is small and contains a single feature
• I have checked my own PR

👍 Most of the time:

• I have added or updated test cases
• I have updated the README if needed

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Dec 5, 2025 3:15pm
vendure-storybook	Ready	Preview	Comment	Dec 5, 2025 3:15pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch oxlint-migration

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud