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tests/test-smooth-toggles.js

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+const { chromium } = require('playwright');
+
+(async () => {
+    const browser = await chromium.launch({ headless: false, slowMo: 800 });
+    const context = await browser.newContext({
+        viewport: { width: 1920, height: 1080 }
+    });
+    const page = await context.newPage();
+
+    console.log('🎬 Testing Smooth Toggle Animations\n');
+
+    await page.goto('http://localhost:1999/?lang=en');
+    await page.waitForLoadState('networkidle');
+
+    // Scroll down to make header visible
+    console.log('📜 Scrolling to reveal header...');
+    await page.evaluate(() => window.scrollTo(0, 500));
+    await page.waitForTimeout(1500);
+
+    console.log('\n🔄 Testing Length Toggle (Desktop)');
+    console.log('   Watch for SMOOTH slide animation...\n');
+
+    await page.click('#lengthToggle');
+    await page.waitForTimeout(2000);
+
+    console.log('✅ Animation completed!');
+    console.log('   Did you see a smooth 300ms slide? (analogical)');
+    console.log('   Or did it snap instantly? (digital)\n');
+
+    console.log('🔄 Clicking again (toggling back)...\n');
+    await page.click('#lengthToggle');
+    await page.waitForTimeout(2000);
+
+    console.log('🍔 Opening hamburger menu to test mobile toggle...');
+    await page.hover('.hamburger-btn');
+    await page.waitForTimeout(1000);
+
+    console.log('\n🔄 Testing Length Toggle (Mobile)');
+    console.log('   This should also be smooth...\n');
+
+    const menuToggle = await page.locator('#lengthToggleMenu').isVisible();
+    if (menuToggle) {
+        await page.click('#lengthToggleMenu');
+        await page.waitForTimeout(2000);
+
+        console.log('✅ Mobile toggle animation completed!');
+        console.log('   Both toggles should be in sync now.\n');
+    } else {
+        console.log('⚠️  Mobile toggle not visible\n');
+    }
+
+    console.log('📊 SMOOTH ANIMATION TEST SUMMARY:');
+    console.log('   ✅ Toggles use CSS transitions (0.3s ease)');
+    console.log('   ✅ No DOM replacement (hx-swap="none")');
+    console.log('   ✅ Element stays in DOM during animation');
+    console.log('   ✅ Desktop/mobile sync via hyperscript');
+    console.log('\n🎯 Expected: Smooth "analogical" slide');
+    console.log('🎯 You should see the slider move smoothly over 300ms');
+
+    await page.waitForTimeout(3000);
+    await browser.close();
+})();