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_working.py

@@ -268,8 +268,6 @@ def run_next_demo(runtime):
         # Clean up timers from previous demo
         for timer in ["opacity_0", "opacity_1", "opacity_2", "opacity_3", 
                       "c_green", "c_blue", "c_white"]:
-            if not mcrfpy.getTimer(timer):
-                continue
             try:
                 mcrfpy.delTimer(timer)
             except: