Fix module issues, fix styling, add conditions to when the background removal and edit controls are shown

src/components/canvas/TShirtSVG.jsx

@@ -1,10 +1,12 @@
+import '../../styles/TShirtSVG.css';
+
 export function TShirtSVG({ size = 300 }) {
   const padding = size * 0.1;
   const innerSize = size - padding * 2;
 
   return (
     <svg width={size} height={size} viewBox={`0 0 ${size} ${size}`}
-      style={{ position: 'absolute', top: '50%', left: '50%', transform: 'translate(-50%, -50%)', pointerEvents: 'none', zIndex: 0 }}>
+      className="tshirt-svg">
       <path d={`M ${padding} ${padding + innerSize * 0.15} L ${padding + innerSize * 0.15} ${padding} L ${size - padding - innerSize * 0.15} ${padding} L ${size - padding} ${padding + innerSize * 0.15} L ${size - padding} ${size - padding} L ${padding} ${size - padding} Z`}
         fill="none" stroke="var(--border)" strokeWidth="2" strokeDasharray="4,4" />
       <rect x={size * 0.3} y={size * 0.25} width={size * 0.4} height={size * 0.35} fill="none" stroke="var(--accent)" strokeWidth="1.5" opacity="0.5" />