feat: support rstest init command

[fi3ework]

Summary

• Add rstest init browser command with interactive and --yes modes
• Auto-detect project info: React, TypeScript, package manager, test directory
• Generate rstest.browser.config.ts, example component and test files
• Update package.json with test:browser script and devDependencies
• Add e2e test for init browser command

Related Links

Checklist

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

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[Copilot]

Pull request overview

This PR adds an rstest init browser command to scaffold browser testing configuration and example files. The command supports both interactive and non-interactive modes (with --yes flag), auto-detects project settings like framework (React), language (TypeScript/JavaScript), and package manager, then generates appropriate configuration, component, and test files.

Key changes:

• Add interactive CLI initialization with project auto-detection
• Generate browser test configuration and example files
• Automatically update package.json with test scripts and dependencies

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Add new dependencies for CLI prompts and package manager detection
packages/core/src/core/browserLoader.ts	Remove duplicate RSTEST_VERSION declaration (now in env.d.ts)
packages/core/src/cli/init/browser/utils.ts	Add utility functions for file operations and package.json updates
packages/core/src/cli/init/browser/templates.ts	Add template generators for config, components, and tests
packages/core/src/cli/init/browser/index.ts	Export create function for browser initialization
packages/core/src/cli/init/browser/detect.ts	Add project detection logic for framework, language, and package manager
packages/core/src/cli/init/browser/create.ts	Implement main initialization logic with interactive and non-interactive modes
packages/core/src/cli/commands.ts	Register 'init' command with browser subcommand
packages/core/package.json	Add new dependencies for CLI functionality
packages/core/LICENSE.md	Add license notices for new dependencies
package.json	Add Playwright to root dev dependencies
e2e/cli/initBrowser.test.ts	Add e2e test for init browser command

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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