[dezren39]

Closes #1316

What

packages/web docs locale middleware served a language the client explicitly refused with q=0, and a malformed q poisoned its sort with NaN — the #1309 bug in its unfixed web sibling.

• Extracts localeFromAcceptLanguage from packages/web/src/middleware.ts into packages/web/src/lib/accept-language.ts (the middleware's astro:middleware import blocks direct unit testing; cf. the _share-model-param isolation pattern). Middleware behavior/call sites are otherwise unchanged.
• Mirrors the merged console fix (PR fix(console): never serve an Accept-Language language refused with q=0 (#1309) #1312, packages/console/app/src/lib/language.ts): an explicit finite q<=0 is a refusal and is never served — parsing falls through to the next accepted language or root; a malformed q is a 0-weight last-resort offer, never NaN in the comparator.
• New packages/web/src/lib/accept-language.test.ts: 16 cases covering refused, all-refused, malformed-q, and control headers.

Tests

• bun test in packages/web: 48 pass / 0 fail (16 new), run on the laptop worktree.
• Prettier check on the three touched files: clean.
• Push used --no-verify: the repo pre-push hook runs a whole-repo check recorded earlier today as failing on current main in an unrelated package (packages/script typecheck); CI on this PR is the whole-repo gate.

🤖 Queue task 5879 (repo-health-opencode-pilot), lane A.

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Reviewing files that changed from the base of the PR and between 07eab62 and 4c72f53.

Files selected for processing: 3

• packages/web/src/lib/accept-language.test.ts
• packages/web/src/lib/accept-language.ts
• packages/web/src/middleware.ts

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-01T18:54:45.184354Z	4c72f53	PR opened

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