deps: upgrade ramune v0.11.1 → v0.12.0

deps: upgrade ramune v0.9.2 → v0.11.1

deps: upgrade ramune v0.9.1 → v0.9.2

deps: upgrade ramune v0.8.0 → v0.9.0

fix: remove accidental ShowHidden, deduplicate zenityOpts, guard read…

…y close

docs: update MCP Apps section in README

feat: add React support alongside Preact

Add WithUILibrary(dark.React) option to switch SSR, Islands hydration,
and MCP Apps from Preact to React. Preact remains the default.

- Add uikit abstraction encapsulating all library-specific strings
  (createElement, renderToString resolver, JSX config, hydration code)
- Update renderer, island builder, and MCP bundler to use uikit
- Add React polyfills (MessageChannel, TextEncoder, TextDecoder) via
  ramune PreloadJS for minimal JS runtimes
- Add --ui flag to scaffold CLI (dark new myapp --ui react)
- Add hello-react example with Island hydration
- Add React test fixtures and tests
- Bump ramune to v0.6.0 (subpath import + PreloadJS support)

Initial commit