fix(browser-logs): correct source map path handling for relative paths

[chenjiahan]

Summary

Update source map parsing logic to properly handle paths relative to source map location.

From https://sourcemaps.info/spec.html:

If the sources are not absolute URLs after prepending of the “sourceRoot”, the sources are resolved relative to the SourceMap (like resolving script src in a html document).

Related Links

• fix(browserLogs): correct source path resolution #6449

Checklist

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

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[Copilot]

Pull Request Overview

This PR fixes source map path handling to correctly resolve relative source paths according to the source maps specification. The fix ensures that relative source paths in source maps are resolved relative to the source map file's location rather than the dist directory.

Key Changes:

• Modified parseFrame to return both the source map path and original position
• Updated resolveSourceRelativeToRoot to resolve relative paths from the source map's directory instead of the dist directory
• Adjusted test case to verify correct behavior with source paths relative to source map location

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/core/src/server/browserLogs.ts	Updated source map resolution logic to use source map path as base for relative sources
e2e/cases/browser-logs/custom-source-map/index.test.ts	Updated test to verify relative path resolution from source map location

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