Optimize dot rendering rotation performance

Replaced expensive canvas state modifications (save, translate, rotate, restore) with native ellipse rotation parameter. This change significantly reduces the number of canvas API calls per drawn dot in dot stretching mode.

Co-authored-by: jsem-nerad <88319121+jsem-nerad@users.noreply.github.com>

Author: google-labs-jules[bot]

.gitignore

@@ -0,0 +1 @@
+node_modules/

src/dotwave.js

@@ -394,21 +394,11 @@
         const radiusX = dot.radius + stretchAmount;
         const radiusY = dot.radius;
 
-        // Save context state
-        this.ctx.save();
-        
-        // Translate to dot position and rotate
-        this.ctx.translate(dot.x, dot.y);
-        this.ctx.rotate(dot.currentAngle);
-        
-        // Draw stretched ellipse
+        // Draw stretched ellipse with built-in rotation
         this.ctx.beginPath();
-        this.ctx.ellipse(0, 0, radiusX, radiusY, 0, 0, Math.PI * 2);
+        this.ctx.ellipse(dot.x, dot.y, radiusX, radiusY, dot.currentAngle, 0, Math.PI * 2);
         this.ctx.fillStyle = fillStyle;
         this.ctx.fill();
-        
-        // Restore context state
-        this.ctx.restore();
     };
 
     /**