feat: add catalog name completion in package.json

[RYGRIT]

There are currently two problems.

1. Catalog smart categorization prompts take a while to appear
2. Setting the range will cause catalog completion to not be displayed.

[coderabbitai]

📝 Walkthrough

Walkthrough

This change introduces catalog-based completion item support to the editor. A new getCatalogs() method is added to WorkspaceContext to safely expose catalogue data, with updated null-handling logic in the workspace context. A new CatalogCompletionItemProvider class is implemented to provide completion items for catalogues, triggered by the ':' character. The provider is then registered in the completion item provider system for package JSON files via a new watch effect, whilst preserving the existing version-based completion provider registration and logic.

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description directly addresses the changeset by identifying specific problems (slow catalog prompts and range-related display issues) and the PR objectives confirm the implementation adds catalog name completion to solve these issues.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 289ada72-3744-4f7b-9429-fe0db80925d6

📥 Commits

Reviewing files that changed from the base of the PR and between b5cacf5 and ae8b0e5.

📒 Files selected for processing (3)

• src/core/workspace.ts
• src/providers/completion-item/catalog.ts
• src/providers/completion-item/index.ts