feat(i18n): add full Traditional Chinese (zh-TW) UI support

[H-Chris233]

User description

Summary

• Add full zh-TW locale resource file for Traditional Chinese UI
• Wire zh-TW into i18n supported locales, resource registration, persisted preference, and system locale detection
• Add Traditional Chinese option in both language selectors (Settings page + Settings modal)
• Add type-level shape lock for zh-TW (typeof zhCN) to avoid future key drift

Verification

• npm run -s build (in openless-all/app)

Scope

• Minimal changes, limited to i18n and language selection UI

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PR Type

Enhancement

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Description

• Add full Traditional Chinese (zh-TW) locale resource file

• Register zh-TW in i18n system, storage, and system detection

• Extend system locale detection to map zh-Hant/TW/HK/MO to zh-TW

• Add Traditional Chinese option in both language selectors

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Diagram Walkthrough

flowchart LR
  A["Create zh-TW.ts locale file"] --> B["Register in i18n/index.ts"]
  B --> C["Update SUPPORTED_LOCALES and resources"]
  B --> D["Enhance system locale detection for zh-TW"]
  C --> E["Add language option in Settings.tsx"]
  D --> E
  C --> F["Add language option in SettingsModal.tsx"]

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File Walkthrough

Relevant files

Enhancement

zh-TW.ts Add Traditional Chinese locale resource file                          openless-all/app/src/i18n/zh-TW.ts Added complete Traditional Chinese locale file (515 lines) Typed as typeof zhCN to lock key shape and prevent future drift +515/-0  index.ts Integrate zh-TW into i18n system                                                  openless-all/app/src/i18n/index.ts Imported zhTW module Added 'zh-TW' to SUPPORTED_LOCALES Updated detectSystemLocale() to return 'zh-TW' for zh-Hant/TW/HK/MO Updated getStoredLocale() to accept 'zh-TW' Registered 'zh-TW' translation resource in i18next +8/-3      en.ts Add Traditional Chinese label in English locale                    openless-all/app/src/i18n/en.ts Added zhTW: '繁體中文' under settings.language +1/-0      zh-CN.ts Add Traditional Chinese label in Simplified Chinese locale openless-all/app/src/i18n/zh-CN.ts Added zhTW: '繁體中文' under settings.language +1/-0      SettingsModal.tsx Add Traditional Chinese option in Settings modal picker    openless-all/app/src/components/SettingsModal.tsx Added with t('settings.language.zhTW') in the language selector +1/-0      Settings.tsx Add Traditional Chinese option in Settings page picker      openless-all/app/src/pages/Settings.tsx Added with t('settings.language.zhTW') in the LanguageSection select +1/-0

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