截图按钮文案抽成函数并跟常量对齐

GameDistributionPublishFormView.tsx：新增 resolveScreenshotPickLabel，替掉嵌套三元并把「截图已满 6 张」改成 MAX_AGC_GAME_SCREENSHOTS。

apps/ai-game-creator-shell/src/components/game-distribution/GameDistributionPublishFormView.tsx

@@ -55,6 +55,18 @@ function resolvePublicationStatusLabel(
   }
 }
 
+/** 截图选择按钮的文案：满 / 上传中 / 可添加三态，上限跟着常量走。 */
+function resolveScreenshotPickLabel(state: {
+  activeScreenshotCount: number;
+  screenshotsUploading: boolean;
+}) {
+  if (state.activeScreenshotCount >= MAX_AGC_GAME_SCREENSHOTS) {
+    return `截图已满 ${MAX_AGC_GAME_SCREENSHOTS} 张`;
+  }
+  if (state.screenshotsUploading) return '截图上传中…';
+  return '添加截图';
+}
+
 /**
  * 发布资料表单的表现层（工作台内联形态）。
  *
@@ -289,11 +301,10 @@ export function GameDistributionPublishFormView({
               }}
             />
             <span className="game-distribution-publish-panel__pick">
-              {activeScreenshotCount >= MAX_AGC_GAME_SCREENSHOTS
-                ? '截图已满 6 张'
-                : screenshotsUploading
-                  ? '截图上传中…'
-                  : '添加截图'}
+              {resolveScreenshotPickLabel({
+                activeScreenshotCount,
+                screenshotsUploading,
+              })}
             </span>
           </span>
           <span className="game-distribution-publish-panel__hint">