复用胶囊标签收口画布尺寸提示

画布图片 hover 尺寸标签改为复用 PlatformPillBadge，统一覆盖层 badge 基础结构。

删除尺寸标签局部圆角、字号和排版样式，仅保留画布内定位与深色覆盖。

补充编辑器测试覆盖共享胶囊标签 class，并更新 TRACKING。

src/components/image-editor/ImageCanvasEditorView.tsx

@@ -71,6 +71,7 @@ import {
 } from '../common/PlatformFloatingMenu';
 import { PlatformIconButton } from '../common/PlatformIconButton';
 import { PlatformInlineOptionButton } from '../common/PlatformInlineOptionButton';
+import { PlatformPillBadge } from '../common/PlatformPillBadge';
 import { PlatformStatusMessage } from '../common/PlatformStatusMessage';
 import { PlatformTextField } from '../common/PlatformTextField';
 import { UnifiedModal } from '../common/UnifiedModal';
@@ -2575,9 +2576,13 @@ export function ImageCanvasEditorView() {
                       />
                     ) : null}
                     {isHovered ? (
-                      <span className="image-canvas-editor__size-badge">
+                      <PlatformPillBadge
+                        tone="lightOverlay"
+                        size="xs"
+                        className="image-canvas-editor__size-badge"
+                      >
                         {Math.round(layer.width)} x {Math.round(layer.height)} px
-                      </span>
+                      </PlatformPillBadge>
                     ) : null}
                   </button>
                 );