feat: implement Convex-synced canvas foundation

components/canvas/nodes/text-node.tsx

@@ -0,0 +1,25 @@
+"use client";
+
+import { Handle, Position, type Node, type NodeProps } from "@xyflow/react";
+
+import BaseNodeWrapper from "./base-node-wrapper";
+
+export type TextNodeData = {
+  content?: string;
+};
+
+export type TextNode = Node<TextNodeData, "text">;
+
+export default function TextNode({ data, selected }: NodeProps<TextNode>) {
+  return (
+    <BaseNodeWrapper selected={selected} className="w-64 p-3">
+      <div className="mb-1 text-xs font-medium text-muted-foreground">Text</div>
+      <p className="min-h-[2rem] whitespace-pre-wrap text-sm">{data.content || "Text eingeben..."}</p>
+      <Handle
+        type="source"
+        position={Position.Right}
+        className="!h-3 !w-3 !border-2 !border-background !bg-primary"
+      />
+    </BaseNodeWrapper>
+  );
+}