feat: migrate os selector to jaspr

[schultek]

Migrates the osSelector shortcode and js code to Jaspr.

Part pf #12548

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[gemini-code-assist]

Summary of Changes

Hello @schultek, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request undertakes a significant refactoring effort by migrating the existing operating system selection mechanism from a shortcode and imperative JavaScript to a declarative Jaspr component. This change centralizes the OS selection logic within the Jaspr framework, improving maintainability and consistency across the site's interactive elements and streamlining the codebase by removing legacy JavaScript.

Highlights

• Jaspr Component Migration: The existing osSelector shortcode and its associated JavaScript logic have been fully migrated to a new Jaspr OsSelector component, centralizing the functionality within the Jaspr framework.
• New OsSelector Component: A new site/lib/src/components/os_selector.dart file has been added, introducing a StatefulComponent responsible for OS detection, managing the selected OS state, and rendering interactive OS selection buttons.
• JavaScript Cleanup: Redundant JavaScript functions (_osNameFromId, _adjustSelectedOs, setupOsSelectors) and their invocation in site/web/assets/js/main.js have been removed, as their functionality is now handled by the Jaspr component.
• OS Detection Utility: A new OperatingSystem enum and a getOS() function have been added to site/lib/src/util.dart to provide client-side operating system detection based on the user agent.
• Markdown Integration Update: All relevant Markdown content files have been updated to use the new <OSSelector /> component syntax, replacing the old {% osSelector %} shortcode.

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[gemini-code-assist]

Code Review

This pull request successfully migrates the OS selector from JavaScript to a client-side Jaspr component. The implementation is well-structured, moving the OS detection logic to a shared utility file and creating a self-contained OsSelector component. This is a great improvement. I have a couple of suggestions to enhance maintainability and accessibility in the new component.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit f786d43):

https://flutter-docs-prod--pr12560-feat-migrate-os-selector-1se6df89.web.app

[sfshaza2]

Hi Killian! Nice to see you 'round here!

[parlough]

Love it, thanks @schultek!