Fix: infer publicPath from webpack output.publicPath for import map

[titouanmathis]

Summary

Fixes #60 — the publicPath preset option is now truly optional. When omitted, it is automatically inferred from webpack's output.publicPath.

Problem

resolveDependencies() was called in the preset handler before the webpack config was built. At that point, output.publicPath didn't exist yet — it was only set later when the consumer's webpack() callback ran. This forced consumers to duplicate the publicPath value in both the preset options and the webpack config.

Solution

1. resolveDependencies() no longer accepts a publicPath parameter — self-hosted entries always get bare paths (e.g. /static/deps/…)
2. In the preset's extendWebpack callback (which runs after all consumer config callbacks), the effective publicPath is resolved and used to mutate twigData.importMap — prefixing self-hosted entries. This works because the twig data object is a reference captured by the prototyping preset's closure.
3. A new shared resolvePublicPath() utility is extracted and used by both the preset and PlaygroundDependenciesPlugin.

Changes

File	Change
resolve-public-path.ts	New shared utility (+ 11 tests)
resolve-dependencies.ts	Removed publicPath param and normalizePublicPath()
playground.ts (preset)	Deferred publicPath resolution + import map mutation in extendWebpack
PlaygroundDependenciesPlugin.ts	Uses shared resolvePublicPath() instead of private method
Tests	Updated to match new signatures; moved publicPath tests to dedicated file

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[codecov]

Codecov Report

❌ Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 18.51%. Comparing base (db2aff6) to head (fe758c0).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/playground/src/lib/presets/playground.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #61      +/-   ##
===========================================
+ Coverage    17.82%   18.51%   +0.68%     
===========================================
  Files           53       54       +1     
  Lines          937      940       +3     
  Branches       165      165              
===========================================
+ Hits           167      174       +7     
+ Misses         757      753       -4     
  Partials        13       13              

Flag	Coverage Δ
unittests	18.51% <94.73%> (+0.68%)	⬆️

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