Fix/mcp app blank UI (#580)

* 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>

* chore: bump version to 2.34.5 for npm publish

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [2.34.4] - 2026-02-07
+## [2.34.5] - 2026-02-08
 
 ### Fixed
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp",
-  "version": "2.34.4",
+  "version": "2.34.5",
   "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",