fix(translate): avoid redundant skip-language LLM detection

[frogGuaGuaGuaGua]

Closes #1353
Related: #1110

Summary

• disable skip-language LLM detection when the active page translation provider is itself an LLM provider
• keep skip-language LLM detection enabled for non-LLM translation providers
• add focused regression coverage for both provider paths and include a patch changeset

Why

Current main still calls shouldSkipByLanguage(preparedText, skipLanguages, config.languageDetection.mode === "llm") inside src/utils/host/translate/translate-variants.ts, so page translation can make an extra LLM language-detection call before the real LLM translation call.

For the behavior reported in #1353, the skip-language check should stay franc-only when page translation itself is using an LLM provider. Non-LLM translation providers should continue using the configured LLM language detection path.

Implementation

• gate shouldSkipByLanguage(...) with config.languageDetection.mode === "llm" && !isLLMProviderConfig(providerConfig) in src/utils/host/translate/translate-variants.ts
• add src/utils/host/translate/__tests__/translate-variants.test.ts to assert:
  • openai-default -> shouldSkipByLanguage(..., false)
  • microsoft-translate-default -> shouldSkipByLanguage(..., true)
• add .changeset/fresh-guests-sit.md

Validation

• SKIP_FREE_API=true pnpm exec vitest run --configLoader runner src/utils/host/translate/__tests__/skip-language.test.ts src/utils/host/translate/__tests__/translate-variants.test.ts
• pnpm exec eslint src/utils/host/translate/translate-variants.ts src/utils/host/translate/__tests__/translate-variants.test.ts
• pnpm run type-check
• pre-push hook: nx run @read-frog/extension:lint
• pre-push hook: nx run @read-frog/extension:type-check
• pre-push hook: nx run @read-frog/extension:test

[changeset-bot]

🦋 Changeset detected

Latest commit: 6e47c6d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@read-frog/extension	Patch

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[github-actions]

Contributor trust score

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Outcome

• PR: fix(translate): avoid redundant skip-language LLM detection #1354 — fix(translate): avoid redundant skip-language LLM detection
• Author: @frogGuaGuaGuaGua
• Trust label: contrib-trust:moderate
• Maintainer review: not required
• Override label: add trust-check:skip to stop future trust automation updates

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Dimension	Score	Signals
Repo familiarity	21/35	commits in repo, merged PRs, reviews
Community standing	11/25	account age, followers, repo role
OSS influence	0/20	stars on owned non-fork repositories
PR track record	10/20	merge rate across resolved PRs in this repo

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• Repo commits: 12 (author commits reachable from the repository default branch)
• Repo PR history: merged 14, open 6, closed-unmerged 15
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• Account age: 1 month
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