fix: detect installed collections from Nuxt rootDir/workspaceDir

[benjamincanac]

🔗 Linked issue

Related #473

📚 Description

Resolve @iconify-json/* auto-discovery from nuxt.options.rootDir / workspaceDir instead of process.cwd(), so collections installed in a subproject's node_modules are detected when nuxt dev is run from a pnpm workspace root.

[coderabbitai]

📝 Walkthrough

Walkthrough

This change introduces Nuxt context awareness to collection path resolution and discovery. The module now passes the Nuxt instance to helper functions that resolve iconify-json collection paths and detect installed collections. The resolution mechanism uses the Nuxt root directory to dynamically determine whether the full @iconify/json bundle is installed or individual @iconify-json/<collection> packages are being used, affecting both path generation for bundling and collection discovery logic. The exported function isFullCollectionExists is replaced with a new hasFullCollection(nuxt) function.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: detect installed collections from Nuxt rootDir/workspaceDir' clearly and specifically describes the main change—updating collection detection to use Nuxt context paths instead of process.cwd().
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description clearly explains the problem (collections not detected from workspace subprojects) and the solution (use nuxt.options.rootDir/workspaceDir instead of process.cwd()).

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/detect-collections

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