fix(browser-logs): simplify file paths for full stack trace

[chenjiahan]

Summary

Simplify file paths when printing browser logs with full stack trace:

- at ./src/index.js (src/index.js:3:0)
+ at src/index.js:3:0

Checklist

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

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[Copilot]

Pull Request Overview

This PR simplifies the format of file paths in browser error stack traces by removing redundant path information when the method name would be a file path.

• Extracts duplicate logic into a reusable isValidMethodName helper function
• Updates stack trace formatting to exclude file paths from the method name position
• Updates test expectations to reflect the simplified format

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	Adds isValidMethodName helper to detect and filter out file paths from method names, replacing duplicate validation logic
e2e/cases/browser-logs/stack-trace-full/index.test.ts	Updates expected stack trace format to reflect simplified output without duplicate file path in method name position

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