Resolves the remaining review threads:
- Reset to auto-detect across all three layers (Greptile): store passes
language:null through as null-as-delete; dashboard gains an Auto option
(clearLanguage + hasExplicitChoice in useLanguage, re-detects from
navigator, syncs cross-tab); CLI accepts 'fn settings set language auto'.
Catalog keys added for all five locales; tests at every layer.
- CLI i18n test singleton: afterEach locale restore so zh-CN/fr switches
can't leak across cases (CodeRabbit nitpick)
- useLocaleFormat memoized per locale for stable formatter identities
(CodeRabbit nitpick)
- settings-reference.md documents the auto reset path
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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