API 参考
Viva 各个包导出的全部类型、函数与常量，由 Go 源码及其文档注释生成。
API 文档由 Go 源码生成，内容为英文。
github.com/vivaui/viva/app
Package app owns the small public lifecycle surface for Viva applications.
github.com/vivaui/viva/ui
Package ui defines lightweight, platform-neutral paint primitives.
github.com/vivaui/viva/components
Package components contains source-oriented UI recipes built from ui primitives.
github.com/vivaui/viva/text
Package text owns platform-neutral text editing and shaping contracts.
github.com/vivaui/viva/headless
Package headless operates a Viva application without opening a window.