- Rename appearance-tab → preferences-tab; AppearanceTab → PreferencesTab
- i18n top-level key appearance → preferences; tab label "Appearance" → "Preferences" / "偏好设置"
- Swap icon Palette → SlidersHorizontal (preferences semantic)
- SettingsPage: read active tab from ?tab= via NavigationAdapter, write back with replace() on change; whitelist valid tabs (incl. desktop extras daemon/updates), unknown values fall back to profile
- Update conventions.mdx (en + zh) references to renamed file and i18n key
Why preferences over appearance: the tab held both theme and language; "Appearance" semantically excludes localization. "Preferences" follows Linear/Slack/Discord and leaves room to add timezone/date format later.
Why query param over path: settings tabs are UI modifier state, not resources; query persistence keeps the existing single Next.js route file and desktop memory router unchanged, gives a natural fallback for unknown values, and avoids 404 risk.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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