feat: 下载次数限制，免费额度用完后第一次需要分享，之后需要看广告

miniprogram/focusPages/shape/shape.ts

@@ -1,7 +1,11 @@
 import { SHAPES, ShapeCard } from '../../constants/shapes';
 import { WATER_COLORS, PAPER_SIZE } from '../../constants/colors';
 import ShapeDrawService from '../../service/shapeDrawService';
-import { downloadPrint } from '../../utils/downloadPrint';
+import { downloadPrint, tryUnlockWithRewardedAd } from '../../utils/downloadPrint';
+import {
+    shouldShowShareGuide,
+    shouldUnlockWithAd,
+} from '../../utils/shareGuide';
 
 Page({
     canvas: null as Canvas | null,
@@ -289,6 +293,18 @@ Page({
             return;
         }
 
+        if (shouldUnlockWithAd()) {
+            const unlocked = await tryUnlockWithRewardedAd();
+            if (!unlocked) {
+                return;
+            }
+        }
+
+        if (shouldShowShareGuide()) {
+            this.setData({ showShareDialog: true });
+            return;
+        }
+
         await downloadPrint(this.canvas, {
             errorToast: '请先生成图形',
             trackerName: '图形涂色',
@@ -324,9 +340,14 @@ Page({
     },
 
     /** 分享成功回调（由组件触发） */
-    onShareSuccess() {
-        // 只关闭弹窗，不触发下载
+    async onShareSuccess() {
         this.setData({ showShareDialog: false });
+        if (this.canvas && this.data.shapeList.length > 0) {
+            await downloadPrint(this.canvas, {
+                errorToast: '请先生成图形',
+                trackerName: '图形涂色',
+            });
+        }
     },
 
     onUnload() {