Update @studiometa/playground to 0.3.1

[titouanmathis]

Update @studiometa/playground dependency from 0.2.1 to 0.3.1 in both packages/playground and packages/docs.

Changes

0.3.0

• Replace monaco-editor with modern-monaco (built-in LSP, auto .d.ts fetching, Shiki syntax highlighting)
• Replace eslint with oxlint
• Add htmlLanguage preset option for HTML-superset template languages (Twig, Liquid, etc.)
• Generate .d.ts files for @studiometa/ui with tsgo for TypeScript editor support
• Resolve relative import map URLs to absolute for TypeScript LSP type loading

0.3.1

• Add declarative dependencies option for managing script editor packages (esm.sh, self-hosted via tsdown)
• Add _headers file generation for x-typescript-types (Cloudflare Pages / Netlify)
• Fix relative import map URLs not resolving to absolute URLs for TypeScript LSP

Simplifications in this PR

• Replace manual CopyPlugin + esbuild + tsgo pipeline with declarative dependencies option
• Remove copy-webpack-plugin and @typescript/native-preview dependencies (replaced by tsdown)
• Remove static shim files (deepmerge.js, morphdom.js, motionone-easing.js)
• Simplify index.twig (import map URL resolution now handled internally)
• Remove obsolete patches for @studiometa/playground@0.2.1 and monaco-editor

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.32%. Comparing base (52f37b3) to head (a6a978c).

❗ There is a different number of reports uploaded between BASE (52f37b3) and HEAD (a6a978c). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (52f37b3)	HEAD (a6a978c)
unittests	5	4

Additional details and impacted files

@@              Coverage Diff               @@
##             develop     #500       +/-   ##
==============================================
- Coverage      67.96%   52.32%   -15.65%     
  Complexity        20       20               
==============================================
  Files             77        4       -73     
  Lines           1998       86     -1912     
  Branches         357        0      -357     
==============================================
- Hits            1358       45     -1313     
+ Misses           558       41      -517     
+ Partials          82        0       -82     

Flag	Coverage Δ
unittests	52.32% <ø> (-15.65%)	⬇️

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see 73 files with indirect coverage changes

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