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feat(i18n): language reset-to-auto-detect + review nitpicks (#1352)

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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>
This commit is contained in:
gsxdsm
2026-06-03 13:02:23 -07:00
parent 75213bbb08
commit e08a5633fa
16 changed files with 217 additions and 31 deletions
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docs/settings-reference.md
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@@ -33,7 +33,7 @@ Defaults from `DEFAULT_GLOBAL_SETTINGS`; key scope from `GLOBAL_SETTINGS_KEYS`.
|---|---|---:|---|
| `themeMode` | `"dark" \| "light" \| "system"` | `"dark"` | Dashboard theme mode. |
| `colorTheme` | `ColorTheme` | `"default"` | Dashboard color theme preset. |
| `language` | `"en" \| "zh-CN" \| "zh-TW" \| "fr" \| "es"` | `undefined` | UI language for the dashboard and TUI. When unset, the dashboard detects from localStorage → browser language and the CLI from `--lang` flag → environment locale, falling back to `en`. Validated at the store write boundary (`validateLocale`); invalid values are dropped. |
| `language` | `"en" \| "zh-CN" \| "zh-TW" \| "fr" \| "es"` | `undefined` | UI language for the dashboard and TUI. When unset, the dashboard detects from localStorage → browser language and the CLI from `--lang` flag → environment locale, falling back to `en`. Validated at the store write boundary (`validateLocale`); invalid values are dropped. Reset to auto-detect via the dashboard's "Auto" language option or `fn settings set language auto` (clears the persisted key). |
| `dashboardFontScalePct` | `number` | `100` | Dashboard font scale percentage used by Appearance settings. Valid range: `85` to `125`; applied pre-hydration via document root font-size so board typography (column headers/counts, task cards, and quick-entry text) scales with the setting from first paint. |
| `defaultProvider` | `string` | `undefined` | Default AI provider. |
| `defaultModelId` | `string` | `undefined` | Default AI model ID. |