feat: add initial data node

frontend/src/lib/registerBuiltinNodes.tsx

@@ -4,13 +4,14 @@
  */
 
 import React from 'react'
-import { ScrollText, Sparkles, Variable, Code2 } from 'lucide-react'
+import { ScrollText, Sparkles, Variable, Code2, Database } from 'lucide-react'
 import { registerNodeType } from './nodeRegistry'
 import { NODE_HELP } from './nodeHelp'
 import ConfigNode from '../components/nodes/ConfigNode'
 import RenderingNode from '../components/nodes/RenderingNode'
 import VariableNode from '../components/nodes/VariableNode'
 import FunctionNode from '../components/nodes/FunctionNode'
+import DataNode from '../components/nodes/DataNode'
 
 const ICON_CLASS = 'mr-2 h-4 w-4'
 
@@ -24,7 +25,7 @@ export function registerBuiltinNodes(): void {
     hasInput: true,
     hasOutput: true,
     classification: 'psyche',
-    allowedSourceTypes: ['config', 'variable', 'function'],
+    allowedSourceTypes: ['config', 'variable', 'function', 'data'],
     allowedTargetTypes: ['config', 'render'],
     help: NODE_HELP.config,
     menuLabel: 'Config',
@@ -73,6 +74,22 @@ export function registerBuiltinNodes(): void {
     menuIcon: <Variable className={ICON_CLASS} />,
   })
 
+  registerNodeType({
+    id: 'data',
+    component: DataNode,
+    defaultStyle: { width: 360, height: 280 },
+    defaultData: { rows: [], columns: [], fileName: '' },
+    idPrefix: 'data_',
+    hasInput: false,
+    hasOutput: true,
+    classification: 'physis',
+    allowedTargetTypes: ['config'],
+    help: NODE_HELP.data,
+    menuLabel: 'Data',
+    menuIcon: <Database className={ICON_CLASS} />,
+    connectionLabel: 'data source',
+  })
+
   registerNodeType({
     id: 'function',
     component: FunctionNode,