feat(diagnostic): improve error formatting for data-uri imports

[chenjiahan]

Summary

Add support for displaying formatted error messages when imports fail in data-uri virtual modules.

This includes truncating long snippets and clearly indicating the source as a data-uri module. Also add e2e tests to verify the behavior in both dev and build modes.

Before

After

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull request overview

This PR improves error formatting for data-uri virtual module imports by providing clearer, more concise error messages. When imports fail in data-uri modules, the error messages now display a user-friendly label "data-uri virtual module" along with a truncated snippet of the content (limited to 30 characters) instead of showing the full data-uri which can be extremely long.

Key Changes:

• Added data-uri detection and formatting logic in the error formatter
• Implemented snippet truncation (30 character limit with ellipsis)
• Added comprehensive e2e tests for both dev and build modes

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/helpers/format.ts	Adds data-uri detection and formatting logic with snippet truncation to improve error message readability
e2e/cases/diagnostic/data-uri-import-error/src/index.js	Test fixture that imports a non-existent module via data-uri to trigger an error
e2e/cases/diagnostic/data-uri-import-error/index.test.ts	E2e tests verifying proper error formatting in both dev and build modes

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