复用平台图标按钮收口参考图入口

编辑器生成输入框参考图按钮改为 PlatformIconButton surfaceFloating。

保留生成器局部尺寸和浅灰覆盖，避免重复维护图标按钮基础 chrome。

补充测试覆盖参考图按钮平台浮动按钮 class，并更新 TRACKING。

src/components/image-editor/ImageCanvasEditorView.test.tsx

@@ -731,6 +731,12 @@ describe('ImageCanvasEditorView', () => {
     );
     expect(screen.getByLabelText('图像生成占位图')).toBeTruthy();
     expect(within(generateDialog).getByText('参考图')).toBeTruthy();
+    expect(
+      within(generateDialog).getByRole('button', { name: '添加参考图' }).className,
+    ).toContain('bg-white/94');
+    expect(
+      within(generateDialog).getByRole('button', { name: '添加参考图' }).className,
+    ).toContain('image-canvas-editor__generation-ref');
     expect(within(generateDialog).getByRole('button', { name: '生成比例 1:1 2k 1张' })).toBeTruthy();
     expect(within(generateDialog).getByRole('button', { name: '生成模型 GPT Image' })).toBeTruthy();
     expect(within(generateDialog).getByRole('button', { name: '生成' }).className).toContain(