Unit test TestCoreState.test_smart_canvas fails

[pottumuusi]

There is a slight variation in the error when running pytest with 'main' branch (commit c76be87) checked out and when running with 'XI-dev-2025' branch (81ef2d2) checked out.

All of the unit tests were passing at commit:
1152003
Fix pytests (#28)

The unit test broke at or before commit:
5586cd7
Production deployment fixes 2025-12-09 (#42)

Error in main branch:

>       assert type(core._state) is type(Active())                                                                                                                                                                
E       AssertionError: assert <class 'smart_canvas.core.Idle'> is <class 'smart_canvas.core.Active'>                                                                                                             
E        +  where <class 'smart_canvas.core.Idle'> = type(<smart_canvas.core.Idle object at 0x7cce38101af0>)                                                                                                      
E        +    where <smart_canvas.core.Idle object at 0x7cce38101af0> = <smart_canvas.core.CanvasCore object at 0x7cce38101eb0>._state                                                                            
E        +  and   <class 'smart_canvas.core.Active'> = type(<smart_canvas.core.Active object at 0x7ccde2ce8380>)                                                                                                  
E        +    where <smart_canvas.core.Active object at 0x7ccde2ce8380> = Active()

tests/core_test.py:44: AssertionError

Error in XI-dev-2025 branch:

>       assert type(core._state) is type(ShowPic())                                                                                                                                                               
E       AssertionError: assert <class 'smart_canvas.core.Painting'> is <class 'smart_canvas.core.ShowPic'>
E        +  where <class 'smart_canvas.core.Painting'> = type(<smart_canvas.core.Painting object at 0x744980093d40>)
E        +    where <smart_canvas.core.Painting object at 0x744980093d40> = <smart_canvas.core.CanvasCore object at 0x7449849f7b60>._state
E        +  and   <class 'smart_canvas.core.ShowPic'> = type(<smart_canvas.core.ShowPic object at 0x7449702c7470>)
E        +    where <smart_canvas.core.ShowPic object at 0x7449702c7470> = ShowPic()
                                                                                                         
tests/core_test.py:79: AssertionError