feat(tests): enhance smoke test for exercise navigation

- Added a check to ensure the loading spinner is not visible before navigating to the exercises page, improving test reliability.
- Updated navigation logic to wait for both the URL change and the click event on the exercises link, reducing race conditions.
- Modified the assertion to check for the visibility of the main heading on the exercises page, ensuring stricter validation of page load success.

tests/dev-smoke-test.spec.js

@@ -59,15 +59,30 @@ test('2. Dashboard lädt ohne Fehler', async ({ page }) => {
 test('3. Navigation zu Übungen', async ({ page }) => {
   await login(page);
 
+  await expect(page.locator('.spinner')).toHaveCount(0, { timeout: 10000 });
+
   // Bei Viewport ≥1024px ist .bottom-nav versteckt — Mobile garantieren wie in playwright.config.js
   await page.setViewportSize({ width: 390, height: 844 });
 
-  // Desktop-Sidebar enthält ebenfalls Übungen – nur Mobile-Bottom-Nav klicken (sichtbarer Link)
-  await page.locator('.bottom-nav a[href="/exercises"]').click();
+  // Bottom-Nav: Navigation und URL gemeinsam abwarten (vermeidet race mit networkidle)
+  const exercisesLink = page.locator('.bottom-nav').getByRole('link', { name: /Übungen/i });
+  await Promise.all([
+    page.waitForURL(
+      (u) => {
+        const path = u.pathname.replace(/\/$/, '') || '/'
+        return path === '/exercises'
+      },
+      { timeout: 15000 },
+    ),
+    exercisesLink.click(),
+  ]);
   await page.waitForLoadState('networkidle');
 
-  // Prüfe ob Übungen-Seite geladen
-  await expect(page.locator('h1, h2, .page-title')).toContainText(/übungen/i, { timeout: 5000 });
+  // Wie Test 4 (Vereine): eine eindeutige h1 — nicht h1,h2-Kombi (Strict Mode + mehrere Treffer)
+  const main = page.locator('.app-main');
+  await expect(main.getByRole('heading', { level: 1, name: /Übungen/i })).toBeVisible({
+    timeout: 10000,
+  });
 
   await page.screenshot({ path: 'screenshots/03-uebungen.png' });
   console.log('✓ Übungen-Seite erreichbar');