fix: 修复关卡内图片圆角不正确的问题

assets/prefabs/PageLevel.ts

@@ -1222,19 +1222,34 @@ export class PageLevel extends BaseView {
         // 播放成功音效
         this.playSuccessSound();
 
-        // 通关后根据 punchline 字数重建包袱答案块
-        this.setPunchline(this._currentConfig?.punchline ?? null);
+        const punchline = this.getValidPunchline(this._currentConfig?.punchline ?? null);
+        if (punchline) {
+            // 通关后根据 punchline 字数重建包袱答案块
+            this.setPunchline(punchline);
+        } else {
+            this.hidePunchline();
+        }
 
         const levelId = this._currentConfig?.id ?? '';
         const timeSpent = Math.max(0, Math.round((Date.now() - this._levelStartTime) / 1000));
 
         this.reportLevelCompleted(levelId, timeSpent);
-        await this.delay(PageLevel.PASS_MODAL_DELAY_MS);
+        if (punchline) {
+            await this.delay(PageLevel.PASS_MODAL_DELAY_MS);
+        }
 
         // 显示通关弹窗
         this._showPassModal();
     }
 
+    private getValidPunchline(punchline: string | null): string | null {
+        if (!punchline?.trim()) {
+            return null;
+        }
+
+        return punchline;
+    }
+
     /**
      * 上报通关并获取下一关数据
      */