feat(add-on): legend state

packages/cta-engine/templates/react/add-on/legend-state/assets/src/lib/demo-legend-state.ts

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+import { observable } from "@legendapp/state";
+import { ObservablePersistLocalStorage } from "@legendapp/state/persist-plugins/local-storage";
+import { syncObservable } from "@legendapp/state/sync";
+
+type Todo = {
+  id: number;
+  text: string;
+  completed: boolean;
+};
+// Create an observable
+export const todos$ = observable<Todo[]>([]);
+
+// Persist the observable
+syncObservable(todos$, {
+  persist: {
+    name: "demo-legend-state-todos",
+    plugin: ObservablePersistLocalStorage,
+  },
+});

packages/cta-engine/templates/react/add-on/legend-state/assets/src/routes/demo.legend-state.tsx.ejs

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+import { <% if (fileRouter) { %>createFileRoute<% } else { %>createRoute<% } %> } from '@tanstack/react-router'
+import { todos$ } from "@/lib/demo-legend-state";
+import { For, useObservable } from "@legendapp/state/react";
+import { $React } from "@legendapp/state/react-web";
+<% if (codeRouter) { %>
+import type { RootRoute } from '@tanstack/react-router'
+<% } else { %>
+export const Route = createFileRoute('/demo/legend-state')({
+  component: LegendStateDemo,
+})
+<% } %>
+
+function TodoForm() {
+  const todoText$ = useObservable("");
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+    if (todoText$.peek().trim() === "") return;
+    todos$.push({ id: Date.now(), text: todoText$.peek().trim(), completed: false });
+    todoText$.set("");
+  };
+  return (
+    <form onSubmit={handleSubmit}>
+      <$React.input
+        placeholder="Add a todo"
+        type="text"
+        $value={todoText$}
+        className="bg-white/10 rounded-lg px-4 py-2 outline-none border border-white/20 hover:border-white/40 focus:border-white/60 transition-colors duration-200 placeholder-white/40 w-full"
+      />
+    </form>
+  );
+}
+function TodoList() {
+  return (
+    <ul className="space-y-4">
+      <For each={todos$} optimized>
+        {(todo) => (
+          <li
+            key={todo.id.get()}
+            className="inline-flex items-center gap-2 justify-between w-full"
+          >
+            <span className={todo.completed.get() ? "line-through" : ""}>
+              {todo.text.get()}
+            </span>
+            <span className="flex items-center gap-2 justify-center">
+              <$React.input
+                type="checkbox"
+                $checked={todo.completed}
+                className="w-6 h-6 text-blue-600 bg-gray-100 border-gray-300 rounded-sm focus:ring-blue-500 dark:focus:ring-blue-600 dark:ring-offset-gray-800 focus:ring-2 dark:bg-gray-700 dark:border-gray-600"
+              />
+              <button
+                type="button"
+                onClick={() =>
+                  todos$.splice(
+                    todos$.findIndex((t) => t.id.get() === todo.id.get()),
+                    1,
+                  )
+                }
+                className="focus:outline-none text-white bg-red-700 hover:bg-red-800 focus:ring-4 focus:ring-red-300 font-medium rounded-lg text-xs px-5 py-2.5 dark:bg-red-600 dark:hover:bg-red-700 dark:focus:ring-red-900"
+              >
+                Remove
+              </button>
+            </span>
+          </li>
+        )}
+      </For>
+    </ul>
+  );
+}
+
+function LegendStateDemo() {
+  return (
+    <div
+      className="min-h-[calc(100vh-32px)] text-white p-8 flex items-center justify-center w-full h-full"
+      style={{
+        backgroundImage:
+          "radial-gradient(50% 50% at 80% 80%, #f4a460 0%, #8b4513 70%, #1a0f0a 100%)",
+      }}
+    >
+      <div className="bg-white/10 backdrop-blur-lg rounded-xl p-8 shadow-lg flex flex-col gap-4 text-3xl w-5xl">
+        <h1 className="text-4xl font-bold mb-5">Legend State Example</h1>
+        <TodoForm />
+        <TodoList />
+      </div>
+    </div>
+  );
+}
+
+
+<% if (codeRouter) { %>
+export default (parentRoute: RootRoute) => createRoute({
+  path: '/demo/legend-state',
+  component: LegendStateDemo,
+  getParentRoute: () => parentRoute,
+})
+<% } %>

packages/cta-engine/templates/react/add-on/legend-state/info.json

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+{
+  "name": "Legend State",
+  "description": "A state manager with built-in sync engine to persist state locally or remotely",
+  "phase": "add-on",
+  "templates": ["file-router", "code-router"],
+  "link": "https://legendapp.com/open-source/state/v3/",
+  "routes": [
+    {
+      "url": "/demo/legend-state",
+      "name": "Legend State"
+    }
+  ]
+}

packages/cta-engine/templates/react/add-on/legend-state/package.json

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+{
+  "dependencies": {
+    "@legendapp/state": "3.0.0-beta.30"
+  }
+}