chore: cleanup intl polyfills and dev config

[fallenbagel]

Description

This PR fixes the JavaScript heap out-of-memory error on the dev server introduced by #2874 when compiling /. The OOM was caused by intl-pluralrules and intl-displaynames loading large locale data files on every request via polyfillIntl() in _app.tsx, exhausting heap memory during development.

Both polyfills were unnecessary to begin with. intl-pluralrules was removed because all browsers we support have natively supported Intl.PluralRules since a long time ago.

intl-displaynames because the only known browser issue affects { format: 'script' } (formatjs/formatjs#5889), which we don't use. polyfillIntl now only polyfills Intl.Locale which has a legitimate compatibility reason to exist.

Also fixes the nodemon dev script which had -e specified twice with conflicting values and used the legacy -x flag instead of --exec. Finally adds transpilePackages: ['country-flag-icons'] to suppress a webpack cache warning on every build caused by the package using CommonJS as its main entry point, which confused webpack's JSON module resolution.

How Has This Been Tested?

• Ran pnpm dev
• Visited / and waited for it to compile and load successfully without javscript heap memory OOMing.
• Without this fix, javascript heap memory OOM'd consistently.

Screenshots / Logs (if applicable)

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• Translation keys pnpm i18n:extract
• Database migration (if required)

Summary by CodeRabbit

Release Notes

Chores

• Updated Next.js configuration to improve country-flag-icons build handling
• Streamlined internationalization polyfill logic and removed unused components to reduce bundle size
• Enhanced development server configuration with improved TypeScript file processing

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request simplifies internationalization (i18n) configuration by removing polyfills for plural rules and display names from the runtime, removing their npm dependencies, and updating the development script. Additionally, the Next.js configuration adds transparent transpilation support for the country-flag-icons package.

Changes

Cohort / File(s)	Summary
Build Configuration next.config.js	Added transpilePackages: ['country-flag-icons'] to enable Next.js transpilation of the country-flag-icons package.
Dependencies & Scripts package.json	Removed @formatjs/intl-displaynames and @formatjs/intl-pluralrules runtime dependencies; updated dev script to use nodemon --exec syntax watching ts,json,yml file types.
Internationalization Polyfills src/pages/_app.tsx, src/utils/polyfillIntl.ts	Simplified polyfill strategy: polyfillIntl() now takes no arguments and runs only the intl-locale polyfill, removing conditional logic for plural rules and display names locale data.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Hopping through configs with glee,
Flags now transpile seamlessly!
Stripped the fat, kept locale pure,
Scripts refresh, the builds endure. ✨

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore: cleanup intl polyfills and dev config' accurately describes the main changes: removing unnecessary intl polyfills and fixing the dev server configuration.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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[cypress]

seerr    Run #3419

Run Properties:   Passed #3419  •  ba6ed6c181: chore: cleanup intl polyfills and dev config (#2965)

Project	seerr
Branch Review	develop
Run status	Passed #3419
Run duration	02m 28s
Commit	ba6ed6c181: chore: cleanup intl polyfills and dev config (#2965)
Committer	fallenbagel
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	32
View all changes introduced in this branch ↗︎