fix(browser-logs): should skip anonymous frame

[chenjiahan]

Summary

Should skip anonymous frame when forwarding browser error logs to the terminal.

• Enhance source frame detection to better locate user code
• Ensure error location is only appended when available
• Add test cases for different React error scenarios

Checklist

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

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[Copilot]

Pull Request Overview

This PR enhances browser error log forwarding to skip anonymous frames and better locate user code when reporting runtime errors to the terminal.

• Introduces findSourceFrame function to identify the first stack frame containing user code
• Updates resolveSourceLocation to use the new frame detection logic instead of always using the first frame
• Adds comprehensive test coverage for React error scenarios (undefined property access, effect errors, and event handler errors)

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated no comments.

File	Description
packages/core/src/server/browserLogs.ts	Core logic enhancement to skip anonymous frames and improve source location detection
e2e/cases/browser-logs/react-error/src/*.jsx	Test components demonstrating different React error scenarios
e2e/cases/browser-logs/react-error/rsbuild.config.ts	Configuration for React error test cases
e2e/cases/browser-logs/react-error/index.test.ts	E2E tests validating error location reporting

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