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

frontend/src/App.test.jsx

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+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();
+  });
+});

frontend/src/test/setupTests.js

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+import "@testing-library/jest-dom";