style(canvas): 调整画布组件样式和交互行为

- 更新CSS选择器以正确隐藏和显示画布工具栏元素
- 为模型选择器下拉菜单添加data-canvas-no-zoom属性防止缩放冲突
- 在模型选择器中阻止指针和鼠标事件传播避免意外操作
- 为模型图标添加深色模式反转效果提升视觉一致性

web/src/app/(user)/canvas/components/infinite-canvas.tsx

@@ -65,7 +65,7 @@ export function InfiniteCanvas({ containerRef, viewport, backgroundMode = "lines
 
     const handleWheel = (event: React.WheelEvent<HTMLDivElement>) => {
         const target = event.target instanceof Element ? event.target : null;
-        if (target?.closest(".ant-modal,.ant-popover,.ant-dropdown,.ant-select-dropdown,.ant-picker-dropdown")) return;
+        if (target?.closest("[data-canvas-no-zoom],.ant-modal,.ant-popover,.ant-dropdown,.ant-select-dropdown,.ant-picker-dropdown")) return;
 
         const delta = -event.deltaY;
         const factor = Math.pow(1.1, delta / 100);
@@ -87,6 +87,7 @@ export function InfiniteCanvas({ containerRef, viewport, backgroundMode = "lines
 
     const handlePointerDown = (event: React.PointerEvent<HTMLDivElement>) => {
         const target = event.target instanceof Element ? event.target : null;
+        if (target?.closest("[data-canvas-no-zoom]")) return;
         if (target?.closest("[data-connection-create-menu]")) return;
         const isBackgroundClick = !target?.closest("[data-node-id],[data-connection-id]");