Fix TextPath positioning - remove x/y coordinates

- TextPath positioning is handled by the path data, not x/y coordinates
- Removed x={el.x} and y={el.y} from TextPath to prevent coordinate corruption
- Removes drag handlers from TextPath since curves are centered on canvas
- Text now properly persists when toggling between curved and straight

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/components/DesignCanvas.tsx

@@ -325,7 +325,7 @@ function PrintSurface({
               {elements.map((el) =>
                 el.type === 'text' ? (
                   el.curvedPath ? (
-                    // Curved text path - directly draggable
+                    // Curved text path - centered on canvas
                     <TextPath
                       key={el.id}
                       ref={(node) => {
@@ -336,16 +336,9 @@ function PrintSurface({
                       fontFamily={el.fontFamily}
                       fontSize={el.fontSize}
                       fill={el.fill}
-                      x={el.x}
-                      y={el.y}
-                      draggable
                       listening={true}
                       onClick={() => setSelectedId(el.id)}
                       onTap={() => setSelectedId(el.id)}
-                      onDragEnd={(e) => {
-                        const node = e.target as any;
-                        updateElement(el.id, { x: node.x(), y: node.y() });
-                      }}
                     />
                   ) : (
                     // Regular straight text