PAINTROID-514 Zoom level and position should be reset when creating a new image

[Amit-Matth]

Added a callback mechanism to CanvasStateProvider to reset canvas zoom and position when creating a new image. The canvas now properly resets to default zoom level (0.85) and centered position instead of persisting the previous image's view state.

PAINTROID-514

New Features and Enhancements

• Canvas zoom and position now reset to default when creating a new image

Refactorings and Bug Fixes

• Fixed: Canvas zoom level and position persistence issue when creating new images
• Added resetCanvasScaleCallback to CanvasStateProvider
• Modified IOHandler.newImage() to trigger canvas scale reset
• Registered reset callback in DrawingCanvas.initState()

Implementation based on closed PR #21

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