Update animation demo suite with crash fixes and improvements

- Add warnings about AnimationManager segfault bug in sizzle_reel_final.py
- Create sizzle_reel_final_fixed.py that works around the crash by hiding objects instead of removing them
- Increase font sizes for better visibility in demos
- Extend demo durations for better showcase of animations
- Remove debug prints from animation_sizzle_reel_working.py
- Minor cleanup and improvements to all animation demos

These demos showcase the full animation system capabilities while documenting and working around known issues with object removal during active animations.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/demos/animation_sizzle_reel_fixed.py

@@ -183,7 +183,7 @@ def clear_scene():
     
     # Keep only the first two elements (title and subtitle)
     while len(ui) > 2:
-        ui.remove(ui[2])
+        ui.remove(2)
 
 def run_demo_sequence(runtime):
     """Run through all demos"""