Add request mocking, session management, and storage state management…

[kostapetan]

… documentation

• Introduced request mocking commands and examples in request-mocking.md.
• Added detailed instructions for running custom Playwright code in running-code.md.
• Documented browser session management features and commands in session-management.md.
• Included storage state management commands and examples in storage-state.md.
• Created test generation documentation to assist in generating Playwright test code automatically.
• Added tracing documentation for capturing execution traces for debugging.
• Implemented video recording instructions for capturing browser sessions.
• Updated templates.md to reflect changes in the web server startup command.
• Enhanced test runner documentation with Aspire environment verification steps.
• Modified MCP configuration for agent command.
• Added Playwright CLI configuration for using Microsoft Edge.
• Updated agent commands in AGENTS.md for clarity on Aspire environment startup.
• Adjusted Playwright configuration to use aspire start for web server initialization.
• Changed package.json to use aspire start for development.
• Refactored hooks.ts to manage Aspire server lifecycle more effectively.