Add Liquid framework docs, previews and native platform release

[silveltman]

Liquid now appears alongside Astro and React in the framework switcher. Switching keeps the current component where supported, works from the mobile menu, remembers the selection and updates the homepage links.

Add 58 native component pages with Liquid-rendered previews, matching markup and dependency-aware shadcn commands. Liquid has its own navigation, search, Markdown endpoints and AI indexes. Existing /docs/liquid/ links redirect to the installation guide. The minor changeset publishes the completed native platform and documentation.

The native sources and registry prerequisites have landed in #287 and #288. This final layer contains the docs integration and release changeset; installed theme assets stay identical to those reviewed prerequisites.

Validation:

• Seven documentation browser checks cover desktop/mobile framework switching in Chromium, Firefox and WebKit, plus all 58 native previews.
• The full docs build, React galleries, HTML validation and 355 local links passed. Unit tests cover the native catalog, dependency closure, Markdown and AI indexes.
• Seven native runtime browser tests pass across all three engines, including responsive rules, dynamic translated slides and JavaScript-disabled fallbacks. Real CLI install, repeat-install and preservation tests passed.
• The consuming Shopify template PR passes its static checks and staged build. A local comparison of 276 rendered parts at three viewport widths in all three engines found no style differences.

Local Liquid rendering uses LiquidJS and explicit Shopify substitutes. Store commerce objects and Shopify stylesheet subsetting still require an approved named store/theme. No Shopify store or theme was changed. The canonical public registry install is verified after deployment.

Preview: https://deploy-preview-286--fulldev-ui.netlify.app/liquid/components/button/

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[silveltman]

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