docs: add comprehensive manual testing guide for VSCode extension

[Patrick-Ehimen]

• Added detailed test cases for all extension features
• Included setup instructions and prerequisites
• Documented error scenarios and edge cases
• Added performance and regression testing guidelines
• Included platform-specific testing checklist
• Provided troubleshooting and reporting guidelines

Summary by Sourcery

Add a comprehensive manual testing guide for the Lighthouse VSCode extension, detailing setup, test cases, performance and regression checklists, platform compatibility, troubleshooting, and reporting procedures.

Documentation:

• Add setup and prerequisite instructions for building and installing the extension
• Document 15 manual test scenarios covering activation, configuration, file and dataset operations, UI interactions, error handling, progress tracking, and multi-root workspaces
• Include performance testing procedures, regression testing checklist, and platform-specific testing matrix
• Provide troubleshooting tips, issue reporting guidelines, automated testing recommendations, and a quick smoke-test script

[sourcery-ai]

Reviewer's Guide

Introduces a comprehensive manual testing guide for the VSCode extension, covering setup prerequisites, detailed feature test cases, performance and regression checklists, platform-specific tests, and troubleshooting/reporting guidelines.

File-Level Changes

Change	Details	Files
Add manual testing guide scaffold and setup instructions	Introduced prerequisites section (VSCode version, Node.js, API key) Outlined build and install methods (dev host and VSIX) Provided initial guide structure and overview	packages/vscode-extension/MANUAL_TESTING.md
Embed detailed testing and support guidelines	Defined step-by-step test cases for activation, API key, commands, file/dataset operations, UI interactions, error handling, and multi-workspace Added sections for performance testing, regression checklist, platform-specific testing, and automated tests Included troubleshooting, reporting, quick test script, and effective testing tips	packages/vscode-extension/MANUAL_TESTING.md

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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