3D 模型角标改用 Tailwind v4 可用的类与专用 CSS 规则

- src/index.css：新增 .image-canvas-editor__kind-badge--model3d 规则，背景与阴影沿用原取值，与其它 asset kind 的写法一致
- src/components/image-editor/ImageCanvasWorldView.tsx：model3d 角标改成引用该规则；原写法用 Tailwind v3 的 `!` 前缀（v4 改后缀），实际不会生成工具类，角标退化成白字无底色的白药丸

验证：npx prettier --check src/index.css src/components/image-editor/ImageCanvasWorldView.tsx

src/components/image-editor/ImageCanvasWorldView.tsx

@@ -293,8 +293,7 @@ const CANVAS_ASSET_KIND_TAG_OPTIONS: Array<{
   {
     value: 'model3d',
     label: '3D模型',
-    badgeClassName:
-      '!bg-[rgba(30,64,175,0.94)] !shadow-[0_8px_18px_rgba(30,64,175,0.26)]',
+    badgeClassName: 'image-canvas-editor__kind-badge--model3d',
   },
   {
     value: 'sound-effect',

src/index.css

@@ -5963,6 +5963,11 @@ html[data-mobile-keyboard-open='true'] .platform-mobile-bottom-dock {
   box-shadow: 0 8px 18px rgba(79, 70, 229, 0.24);
 }
 
+.image-canvas-editor__kind-badge--model3d {
+  background: rgba(30, 64, 175, 0.94);
+  box-shadow: 0 8px 18px rgba(30, 64, 175, 0.26);
+}
+
 .image-canvas-editor__kind-menu-anchor {
   position: absolute;
   width: 0;