Backend and frontend testing stacks (pytest + vitest) and a few initial tests.

frontend/src/App.test.jsx

@@ -0,0 +1,12 @@
+import { render, screen } from "@testing-library/react";
+import App from "./App.jsx";
+
+
+describe("App", () => {
+  it("renders the hero copy", () => {
+    render(<App />);
+    expect(
+      screen.getByText("Find, compare, and book top salons near you.")
+    ).toBeInTheDocument();
+  });
+});