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.py

@@ -258,8 +258,9 @@ def demo_grid_animations(ui):
     except:
         texture = None
     
-    grid = Grid(100, 150, grid_size=(20, 15), texture=texture, 
-                tile_width=24, tile_height=24)
+    # Grid constructor: Grid(grid_x, grid_y, texture, position, size)
+    # Note: tile dimensions are determined by texture's grid_size
+    grid = Grid(20, 15, texture, (100, 150), (480, 360))  # 20x24, 15x24
     grid.fill_color = Color(20, 20, 40)
     ui.append(grid)
     
@@ -282,7 +283,7 @@ def demo_grid_animations(ui):
     
     # Create entities in the grid
     if texture:
-        entity1 = Entity(5.0, 5.0, texture, sprite_index=8)
+        entity1 = Entity((5.0, 5.0), texture, 8)  # position tuple, texture, sprite_index
         entity1.scale = 1.5
         grid.entities.append(entity1)
         
@@ -291,7 +292,7 @@ def demo_grid_animations(ui):
         entity_pos.start(entity1)
         
         # Create patrolling entity
-        entity2 = Entity(10.0, 2.0, texture, sprite_index=12)
+        entity2 = Entity((10.0, 2.0), texture, 12)  # position tuple, texture, sprite_index
         grid.entities.append(entity2)
         
         # Animate sprite changes