Adds the willReadFrequently: true option to all getContext('2d') calls on temporary canvases in Canvas, CanvasLayers, and SAMDetectorIntegration modules. This improves performance for frequent pixel data reads, addressing potential browser optimization issues.
Moved layer drawing logic into CanvasLayers._drawLayer and _drawLayers methods, replacing repeated rendering code in CanvasIO and CanvasLayers. This improves maintainability and ensures consistent handling of layer properties such as blend mode, opacity, rotation, and flipping. Also, fixed layer serialization to only generate imageId when missing, and ensured new layers have flipH/flipV set when created from matted images.
Refactors horizontal and vertical mirroring to toggle flipH/flipV properties on layers instead of modifying image data. Updates rendering logic in CanvasLayers and CanvasRenderer to apply horizontal/vertical flipping via canvas transforms. Adds flipH and flipV to Layer type and includes them in state signature calculation.
