Fix failing App.test.js after UI migration to OctoFit Tracker

[Copilot]

The test file still asserted on the default CRA "learn react" link, causing npm test to fail after the App component was updated to render the OctoFit Tracker UI.

Changes

• Replaced outdated "learn react" test with two tests matching current UI:
  • Verifies welcome heading renders
  • Verifies navbar presence using getByRole('navigation') for semantic specificity

test('renders OctoFit Tracker navbar', () => {
  render(<App />);
  const navbar = screen.getByRole('navigation');
  expect(navbar).toBeInTheDocument();
  expect(navbar).toHaveTextContent('OctoFit Tracker');
});

All tests now pass.

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