Fixed click handling bug with editor node canvas

dev-docs/tasks/phase-2/TASK-002-react19-ui-fixes/README.md

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+# TASK-002: React 19 UI Fixes
+
+## Overview
+
+This task addresses critical React 19 API migration issues that were not fully completed during Phase 1. These issues are causing multiple UI bugs in the node graph editor.
+
+## Problem Statement
+
+After the React 19 migration in Phase 1, several legacy React 17 APIs are still being used in the codebase:
+- `ReactDOM.render()` - Removed in React 18+
+- `ReactDOM.unmountComponentAtNode()` - Removed in React 18+
+- Incorrect `createRoot()` usage (creating new roots on every render)
+
+These errors crash the node graph editor's mouse event handlers, causing:
+- Right-click shows 'grab' hand instead of node picker
+- Plus icon node picker appears at wrong position and overflows
+- Node config panel doesn't appear when clicking nodes
+- Wire connectors don't respond to clicks
+
+## Error Messages
+
+```
+ReactDOM.render is not a function
+    at DebugInspectorPopup.render (nodegrapheditor.debuginspectors.js:60)
+
+ReactDOM.unmountComponentAtNode is not a function
+    at DebugInspectorPopup.dispose (nodegrapheditor.debuginspectors.js:64)
+
+You are calling ReactDOMClient.createRoot() on a container that has already 
+been passed to createRoot() before.
+    at _renderReact (commentlayer.ts:145)
+```
+
+## Affected Files
+
+| File | Issue | Priority |
+|------|-------|----------|
+| `nodegrapheditor.debuginspectors.js` | Uses legacy `ReactDOM.render()` & `unmountComponentAtNode()` | **Critical** |
+| `commentlayer.ts` | Creates new `createRoot()` on every render | **High** |
+| `TextStylePicker.jsx` | Uses legacy `ReactDOM.render()` & `unmountComponentAtNode()` | **Medium** |
+
+## Solution
+
+### Pattern 1: Replace ReactDOM.render() / unmountComponentAtNode()
+
+```javascript
+// Before (React 17):
+const ReactDOM = require('react-dom');
+ReactDOM.render(<Component />, container);
+ReactDOM.unmountComponentAtNode(container);
+
+// After (React 18+):
+import { createRoot } from 'react-dom/client';
+const root = createRoot(container);
+root.render(<Component />);
+root.unmount();
+```
+
+### Pattern 2: Reuse Existing Roots
+
+```typescript
+// Before (Wrong):
+_renderReact() {
+  this.root = createRoot(this.div);
+  this.root.render(<Component />);
+}
+
+// After (Correct):
+_renderReact() {
+  if (!this.root) {
+    this.root = createRoot(this.div);
+  }
+  this.root.render(<Component />);
+}
+```
+
+## Related Tasks
+
+- TASK-001B-react19-migration (Phase 1) - Initial React 19 migration
+- TASK-006-typescript5-upgrade (Phase 1) - TypeScript 5 upgrade
+
+## References
+
+- [React 18 Migration Guide](https://react.dev/blog/2022/03/08/react-18-upgrade-guide)
+- [createRoot API](https://react.dev/reference/react-dom/client/createRoot)