feat(metabar): improve headings and add stability

[avivkeller]

This PR adds Stability notices to the sidebar ("E" for Experimental, "L" for Legacy, "D" for Deprecated, and nothing for Stable). Additionally, it trims CLI flags and Environment variables down to just their names, similarly to how we do for methods.

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Name	Status	Preview	Updated (UTC)
api-docs-tooling	✅ Ready (Inspect)	Visit Preview	Jul 27, 2025 8:19pm

[Copilot]

Pull Request Overview

This PR enhances the documentation sidebar by adding stability indicators (badges) to headings and simplifying CLI flag and environment variable names. The changes improve the visual representation of API stability status and make navigation cleaner by showing only essential names.

• Adds stability badges to headings in the table of contents with visual indicators (E for Experimental, L for Legacy, D for Deprecated)
• Simplifies CLI flag and environment variable headings to show only the flag/variable name
• Includes CSS styling for the new stability badges

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/generators/web/ui/components/MetaBar/index.module.css	Adds CSS styling for stability badges
src/generators/web/ui/components/MetaBar/index.jsx	Implements stability badge rendering logic in the sidebar
src/generators/jsx-ast/utils/buildBarProps.mjs	Extracts stability information and simplifies heading names for CLI flags/env vars

Comments suppressed due to low confidence (1)

src/generators/jsx-ast/utils/buildBarProps.mjs:44

• [nitpick] The variable name 'cliFlagOrEnv' is ambiguous. Consider renaming to 'cliFlagOrEnvMatches' to better indicate it contains regex match results.

  const cliFlagOrEnv = [...data.text.matchAll(/`(-[\w-]+|[A-Z0-9_]+=)/g)];

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 3 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@a470b27). Learn more about missing BASE report.
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/generators/jsx-ast/utils/buildBarProps.mjs	83.33%	3 Missing ⚠️

Additional details and impacted files

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  Hits            ?     8261           
  Misses          ?     2822           
  Partials        ?        3           

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[AugustinMauroy]

LGTM