feat: display resolved catalog spec in editor

[9romise]

Inspired by https://github.com/hverlin/mise-vscode

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request introduces inline decoration functionality for displaying resolved version specifications of catalog dependencies in package.json files. A new useDecorators() function is added to handle VSCode decorations that render dependency information. The function subscribes to active editor changes, validates package manifest files, resolves dependencies with the catalog protocol, and displays the resolved specification as after-content decorations on corresponding lines. The extension activation sequence is updated to invoke this decorator when the extension initialises. Documentation is updated to reflect the new Catalog Resolution feature.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description is related to the changeset, referencing an external inspiration and including a visual example of the feature being implemented.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch catalog

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