perf(CodeEditor): lazy load all languages

[jsulpis]

Summary

CodeEditor previously bundled every language grammar (total ~530kB minzipped) via @uiw/codemirror-extensions-langs.

Now languages are lazy-loaded on demand:

• @codemirror/language-data resolves languages by extension and import()s them only when used.
• nix, svelte, solidity (missing from language-data) added via @replit/codemirror-lang-*.
• extensions is now a typed LanguageName union; unknown values fall back to sh (unchanged).

Dropped @uiw/codemirror-extensions-langs and updated the renovate CodeMirror matcher.

Note: the only functional change should be that the python extension is no longer recognized (other python extensions like py or pyw still work). It was mapped by @uiw/codemirror-extensions-langs but it's not in @codemirror/language-data. I checked in the console that only .py is used.

How to test

Baseline in prod:

1. go to https://storybook.ultraviolet.scaleway.com/?path=/story/compositions-codeeditor--playground
2. open the network tab
3. see a huge CodeEditor js chunk
4. when changing the language in the playground ("rs", "py", "lua"...) you should not see new js files downloaded because all languages are already in the initial chunk

Lazy-load in preview:

1. go to https://ultravioletjxvhzygy-codemirrorperfstorybook.functions.fnc.fr-par.scw.cloud/?path=/story/compositions-codeeditor--playground
2. open the network tab
3. see a much smaller CodeEditor js chunk
4. when changing the language in the playground ("rs", "py", "lua"...) you should see new js files downloaded on demand

You can check the solidity, nix and svelte languages that are loaded differently from the others

[changeset-bot]

🦋 Changeset detected

Latest commit: 4b08396

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@ultraviolet/ui	Patch
@ultraviolet/form	Patch
@ultraviolet/nextjs	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.73%. Comparing base (c63be91) to head (4b08396).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6909      +/-   ##
==========================================
- Coverage   90.97%   83.73%   -7.25%     
==========================================
  Files         572       48     -524     
  Lines       10532      744    -9788     
  Branches     3798      204    -3594     
==========================================
- Hits         9582      623    -8959     
+ Misses        950      121     -829     

see 524 files with indirect coverage changes

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