test: extend frontend prompt dialog coverage

job-tracker-ui/src/prompt.test.tsx

@@ -25,3 +25,15 @@ test('renders app-owned prompt dialog', async () => {
   expect(screen.getByDisplayValue('resume.pdf')).toBeInTheDocument();
   expect(screen.getByRole('button', { name: /rename/i })).toBeInTheDocument();
 });
+
+test('shows prompt input helper length text', async () => {
+  render(
+    <PromptProvider>
+      <Demo />
+    </PromptProvider>,
+  );
+
+  fireEvent.click(screen.getByRole('button', { name: /open prompt/i }));
+
+  expect(await screen.findByText(/10\/180/i)).toBeInTheDocument();
+});