- Disable pinch/double-tap zoom via the viewport meta (system-level
accessibility zoom is unaffected).
- Add viewport-fit=cover so standalone mode renders edge-to-edge; the
layout already uses env(safe-area-inset-*) from #4693.
- Add apple-mobile-web-app-* metas for standalone launch, status bar, and
home screen label on iOS.
- Prevent double-tap zoom and orientation text inflation via inline CSS.
- Add manifest.json with icons for install prompt
- Add service worker with cache-first for static assets
- Register SW in main.tsx
- Link manifest in index.html
- Add explicit CJK fonts (PingFang SC, Noto Sans SC, Microsoft YaHei) and
programmer fonts (JetBrains Mono, Fira Code, Cascadia Code) to Tailwind config
- Bump prose base size from prose-sm (14px) to prose-lg (18px) for sharper CJK rendering
- Unify user/assistant message font size at 18px with CJK-aware line-height (1.8)
- Replace pure black/white foreground with Apple-style warm grays (#1d1d1f / #f5f5f7)
- Override Tailwind Typography colors to use design tokens for consistency
- Add negative letter-spacing on headings for tighter, more polished look
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