fix: remove deprecated Next.js 13 config and bump to 16.1.5

[adrienlupo]

Summary

• Remove deprecated experimental.appDir from next.config.js (stable since Next.js 13.4)
• Migrate @next/font imports to next/font in app/layout.tsx
• Remove @next/font dependency
• Update caniuse-lite browserslist database
• Bump Next.js from 14.2.21 to 16.1.5 (incorporates chore(deps): bump next from 14.2.21 to 16.1.5 #49)

Test plan

• next build passes
• next dev starts with no deprecation warnings

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
website	Ready	Preview	Feb 16, 2026 9:41am

[adrienlupo]

Next.js 16 Migration References

next lint removed

The next lint command has been removed. [...] next build no longer runs linting automatically. The eslint option in the Next.js config file is also removed.

Source: Upgrading to Next.js 16 - Removals

Migration was done using the official codemod:

npx @next/codemod@canary next-lint-to-eslint-cli .

Source: Next.js Codemods - next-lint-to-eslint-cli

experimental.appDir removed

appDir is no longer experimental. [...] It is now the default.

Source: Upgrading to Next.js 14

@next/font removed

The @next/font package has been fully replaced by the built-in next/font.

Source: Upgrading to Next.js 14