fix: physical conveyor realism - belt at 0.7m, item rides ON belt

- Create physicalLayout.ts with all dimensions
- Update conveyorPath.ts to use correct belt height
- Rebuild ConveyorBelt with support legs, rollers, drive motor
- Item Y = BELT_TOP_Y + itemHeight/2

scripts/test_light_scene.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+"""Test light scene and take screenshots."""
+
+from playwright.sync_api import sync_playwright
+import os
+import time
+
+SCREENSHOTS_DIR = '/opt/arhipovdan/app/docs/light_scene_screenshots'
+PROD_URL = 'https://arhipovdan.ru'
+
+def main():
+    os.makedirs(SCREENSHOTS_DIR, exist_ok=True)
+    
+    with sync_playwright() as p:
+        browser = p.chromium.launch(headless=True)
+        page = browser.new_page(viewport={'width': 1920, 'height': 1080})
+        
+        console_errors = []
+        page.on('console', lambda msg: console_errors.append(msg.text) if msg.type == 'error' else None)
+        
+        print(f"1. Navigating to {PROD_URL}/")
+        page.goto(f'{PROD_URL}/')
+        page.wait_for_load_state('networkidle')
+        time.sleep(3)
+        
+        print("2. Taking light_idle screenshot...")
+        page.screenshot(path=f'{SCREENSHOTS_DIR}/light_idle.png')
+        
+        # Verify elements
+        play_button = page.locator('button.play-button')
+        hud = page.locator('.main-hud')
+        progress_dots = page.locator('.progress-dot')
+        
+        print("\nIdle state verification:")
+        print(f"  Play button: {'✓' if play_button.count() > 0 else '✗'}")
+        print(f"  HUD present: {'✓' if hud.count() > 0 else '✗'}")
+        print(f"  Progress dots: {progress_dots.count()}")
+        
+        print("\n3. Clicking Play...")
+        play_button.click()
+        time.sleep(0.5)
+        
+        print("4. Taking light_play_started screenshot...")
+        page.screenshot(path=f'{SCREENSHOTS_DIR}/light_play_started.png')
+        
+        time.sleep(3)
+        
+        print("5. Taking light_running_3s screenshot...")
+        page.screenshot(path=f'{SCREENSHOTS_DIR}/light_running_3s.png')
+        
+        time.sleep(3)
+        
+        print("6. Taking light_route_active screenshot...")
+        page.screenshot(path=f'{SCREENSHOTS_DIR}/light_route_active.png')
+        
+        # Check /details still works
+        print(f"\n7. Checking {PROD_URL}/details")
+        page.goto(f'{PROD_URL}/details')
+        page.wait_for_load_state('networkidle')
+        time.sleep(2)
+        
+        header = page.locator('header')
+        hero = page.locator('.hero-section')
+        
+        print("\nDetails page verification:")
+        print(f"  Header: {'✓' if header.count() > 0 else '✗'}")
+        print(f"  HeroSection: {'✓' if hero.count() > 0 else '✗'}")
+        
+        if len(console_errors) == 0:
+            print("\n✓ No console errors")
+        else:
+            print(f"\n✗ Console errors: {len(console_errors)}")
+            for err in console_errors[:5]:
+                print(f"  - {err[:100]}")
+        
+        print(f"\nScreenshots saved to {SCREENSHOTS_DIR}/")
+        for f in sorted(os.listdir(SCREENSHOTS_DIR)):
+            if f.endswith('.png'):
+                print(f"  - {f}")
+        
+        browser.close()
+        print("\nDone!")
+
+if __name__ == '__main__':
+    main()