Enable willReadFrequently for canvas 2D contexts

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.

src/Canvas.ts

@@ -98,7 +98,8 @@ export class Canvas {
 
         this.offscreenCanvas = document.createElement('canvas');
         this.offscreenCtx = this.offscreenCanvas.getContext('2d', {
-            alpha: false
+            alpha: false,
+            willReadFrequently: true
         });
 
         this.dataInitialized = false;