Fix curved text rendering - move positioning to Group

- Move x/y positioning from TextPath to Group wrapper
- TextPath now renders at default position using only path data
- Group handles x/y positioning and dragging
- Remove fontStyle/letterSpacing from TextPath (not needed)
- This should fix text disappearing when curved text is enabled

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

src/components/DesignCanvas.tsx

@@ -325,32 +325,29 @@ function PrintSurface({
               {elements.map((el) =>
                 el.type === 'text' ? (
                   el.curvedPath ? (
-                    // Curved text - render as separate path-based text
+                    // Curved text - render with path-based positioning
                     <Group
                       key={el.id}
                       ref={(node) => {
                         if (node) nodeRefs.current.set(el.id, node);
                       }}
+                      x={el.x}
+                      y={el.y}
                       draggable
                       listening={true}
                       onClick={() => setSelectedId(el.id)}
                       onTap={() => setSelectedId(el.id)}
                       onDragEnd={(e) => {
                         const group = e.target;
-                        // Update x/y based on the path offset
                         updateElement(el.id, { x: group.x(), y: group.y() });
                       }}
                     >
                       <TextPath
-                        x={el.x}
-                        y={el.y}
                         data={generateCurvePath(el.curvedPath.type, el.curvedPath.radius, el.curvedPath.reverse)}
                         text={el.text}
                         fontFamily={el.fontFamily}
                         fontSize={el.fontSize}
                         fill={el.fill}
-                        fontStyle={el.fontStyle || 'normal'}
-                        letterSpacing={el.letterSpacing || 0}
                         listening={false}
                       />
                     </Group>