fix(guide): silence Vite env deprecation [Codex]

[jderochervlk]

Vite 8.1 deprecates the envFile: false option used internally by React Router 7.15, causing repeated warnings during guide builds. The maintained React Router 7.x line does not include the upstream compatibility fix, while upgrading the guide to React Router 8 would require a separate migration.

The guide now uses a Yarn patch for its existing @react-router/dev@7.15.0 dependency. It replaces the four internal Vite child-compiler uses of envFile: false with the supported envDir: false setting. The patch is scoped only to the guide workspace and recorded in the lockfile for reproducible installs.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-13T14:35:30.048810Z	8ca2382	PR opened

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[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	guide	8ca2382	Commit Preview URL Branch Preview URL	Sep 13 2026, 02:32 PM

[github-actions]

Guide Cloudflare deployment

⛅️ wrangler 4.114.0
────────────────────
🌀 Building list of assets...
✨ Read 10 files from the assets directory /home/runner/work/rescript-lang.org/rescript-lang.org/apps/guide/out
🌀 Starting asset upload...
No updated asset files to upload. Proceeding with deployment...
Total Upload: 0.31 KiB / gzip: 0.22 KiB
Worker Startup Time: 0 ms
Uploaded guide (1.27 sec)
Worker Version ID: 51ed3899-1a09-44b7-a2f7-2ddd24a3c2f0
Version Preview URL: https://51ed3899-guide.rescript.workers.dev
Version Preview Alias URL: https://build-guide-vite-config-guide.rescript.workers.dev

To deploy this version to production traffic use the command wrangler versions deploy

Changes to non-versioned settings (config properties 'logpush' or 'tail_consumers') take effect after your next deployment using the command wrangler versions deploy

Changes to triggers (routes, custom domains, cron schedules, etc) must be applied with the command wrangler triggers deploy

[github-actions]

Cloudflare deployment

Deployement ID: 9246d60e-4241-4966-aea0-f64f8dcab9fb
Deployment Environment: preview

⛅️ wrangler 4.114.0
────────────────────
✨ Compiled Worker successfully
Uploading... (8290/8770)
Uploading... (8450/8770)
Uploading... (8610/8770)
Uploading... (8770/8770)
✨ Success! Uploaded 480 files (8290 already uploaded) (2.97 sec)

✨ Uploading _redirects
✨ Uploading Functions bundle
🌎 Deploying...
✨ Deployment complete! Take a peek over at https://9246d60e.rescript-lang.pages.dev
✨ Deployment alias URL: https://build-guide-vite-config.rescript-lang.pages.dev

[jderochervlk]

We can skip doing this and just update to Vite 8 soon.