docs: add clarifying comment for MCP refresh optimization

- Added comment explaining why state comparison is needed
- Helps future maintainers understand the intentional difference from other handlers
- Clarifies that this prevents expensive MCP server refresh operations

Author: hannesrudolph

src/core/webview/webviewMessageHandler.ts

@@ -906,6 +906,7 @@ export const webviewMessageHandler = async (
 			await updateGlobalState("mcpEnabled", mcpEnabled)
 
 			// Only refresh MCP connections if the value actually changed
+			// This prevents expensive MCP server refresh operations when saving unrelated settings
 			if (currentMcpEnabled !== mcpEnabled) {
 				// Delegate MCP enable/disable logic to McpHub
 				const mcpHubInstance = provider.getMcpHub()