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* fix: use official ext-apps useApp hook to fix blank MCP App rendering The custom useToolData hook had lifecycle issues that prevented the UI from rendering in Claude Desktop/web: no appInfo in App constructor, unhandled connect() Promise, app.close() on unmount conflicting with React Strict Mode. Switched to the official useApp hook from @modelcontextprotocol/ext-apps/react which handles initialization handshake, handler registration, and cleanup correctly. Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * fix: align MCP App UI types with actual server response format - useToolData hook now uses official useApp from ext-apps/react - OperationResultData uses success:boolean + data.id/name (matching McpToolResponse from handlers-n8n-manager.ts) - ValidationSummaryData handles both direct results (validate_node, validate_workflow) and wrapped results (n8n_validate_workflow) - Added visible error/connection states for debugging Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>