rename ui to clan-app and move clan-app one layer up

pkgs/clan-app/webview-ui/app/tests/types.test.ts

@@ -0,0 +1,6 @@
+import { describe, it } from "vitest";
+
+describe.concurrent("API types work properly", () => {
+  // Test some basic types
+  it("distinct success/error unions", async () => {});
+});