test: add bun test runner

apps/web/src/__tests__/smoke.test.ts

@@ -0,0 +1,8 @@
+import { expect, test } from "bun:test";
+
+test("bun test runs", () => expect(1 + 1).toBe(2));
+
+test("package.json has bun test script", async () => {
+  const pkg = await import("../../../../package.json");
+  expect(pkg.scripts.test).toBe("bun test");
+});