fix(svgcanvas): Handle 'none' stroke color in SVG elements (#1084)

This update modifies the stroke color handling in both the SvgCanvas and ext-connector modules. When the stroke color is set to 'none', it now correctly assigns an empty string or 'none' instead of a hex value, ensuring proper rendering of SVG elements without strokes.

packages/svgcanvas/svgcanvas.js

@@ -201,7 +201,9 @@ class SvgCanvas {
           this.curConfig.initFill.color,
         fill_paint: null,
         fill_opacity: this.curConfig.initFill.opacity,
-        stroke: `#${this.curConfig.initStroke.color}`,
+        stroke:
+          (this.curConfig.initStroke.color === 'none' ? '' : '#') +
+          this.curConfig.initStroke.color,
         stroke_paint: null,
         stroke_opacity: this.curConfig.initStroke.opacity,
         stroke_width: this.curConfig.initStroke.width,