Add Browser Refresh Tool - Refresh Currently Active Browser Tab

[isaiahbjork]

Summary

This PR implements a new refreshBrowser tool that allows the MCP server to refresh the currently active browser tab that is connected to the extension.

Changes Made

MCP Server (browser-tools-mcp/mcp-server.ts)

• Added new refreshBrowser tool that sends refresh commands to the browser connector
• Tool targets the specific tab that has the Chrome extension/devtools open
• Includes proper error handling and user feedback

Browser Connector (browser-tools-server/browser-connector.ts)

• Added /refresh-browser endpoint to handle refresh requests
• Added sendRefreshCommand() method to the BrowserConnector class
• Sends WebSocket messages to the Chrome extension with the target tab information
• Provides detailed logging for debugging and user feedback

Chrome Extension (chrome-extension/)

• devtools.js: Added message handler for "refresh-browser" commands
• background.js: Added "REFRESH_TAB" message handler that calls chrome.tabs.reload()
• Extension already has necessary "tabs" permission in manifest.json

Documentation

• Updated README.md to include the new mcp_refreshBrowser tool in the function list

How It Works

1. User calls the refreshBrowser tool through the MCP interface
2. MCP server sends request to browser connector on /refresh-browser endpoint
3. Browser connector sends WebSocket message to Chrome extension
4. Chrome extension calls chrome.tabs.reload() on the specific tab where devtools are open
5. Only the active/connected browser tab is refreshed, not all tabs

Benefits

• Targeted Refresh: Only refreshes the tab with devtools open, not all browser tabs
• Development Workflow: Perfect for refreshing applications during development/editing
• Proper Error Handling: Provides clear feedback if extension is not connected
• Logging: Detailed logging shows which tab and URL is being targeted

Testing

• ✅ Successfully builds both MCP server and browser tools server
• ✅ Chrome extension loads with updated functionality
• ✅ Refresh command properly targets the correct browser tab
• ✅ Error handling works when extension is not connected

This enhancement makes the browser tools more useful for development workflows where frequent page refreshes are needed.