feat: 开发收藏和下载功能

miniprogram/englishPages/letterTracing/letterTracing.ts

@@ -22,7 +22,7 @@ import {
 } from '../shared/data/fontProfiles';
 import { loadLetterFont } from '../shared/draw/drawTools';
 import type { DebugPublishMeta } from '../../utils/debugPublish';
-import { incrementWorksheetLikes } from '../../utils/worksheetStats';
+import { addFavorite, removeFavorite, batchCheckFavorited } from '../../utils/favorites';
 
 /** 三字母精练分组：26 字母每 3 个一组 */
 const TRIPLE_GROUPS: { title: string; letters: string[] }[] = [];
@@ -82,6 +82,7 @@ createPage(
         boxWidth: 0,
         drawService: null as LetterTracingDraw | null,
         fontProfile: DEFAULT_LETTER_PROFILE as FontProfile,
+        _favoritedMap: {} as Record<string, boolean>,
 
         data: {
             pageTitle: '字母描红',
@@ -147,6 +148,8 @@ createPage(
                     updates as Partial<PageData> & WechatMiniprogram.IAnyObject,
                 );
             }
+
+            this.loadFavoritedMap();
         },
 
         /** 用户点击模式选择器时切换 worksheet */
@@ -275,8 +278,14 @@ createPage(
         async onPreviewFavorite() {
             const next = !this.data.isPreviewFavorite;
             this.setData({ isPreviewFavorite: next });
-            if (next) {
-                incrementWorksheetLikes(this.data.worksheetId);
+            const id = this.data.worksheetId;
+            if (id) {
+                this._favoritedMap[id] = next;
+                if (next) {
+                    addFavorite(id);
+                } else {
+                    removeFavorite(id);
+                }
             }
             wx.showToast({
                 title: next ? '收藏成功' : '已取消收藏',
@@ -284,6 +293,15 @@ createPage(
             });
         },
 
+        async loadFavoritedMap() {
+            const ids = LETTER_TRACING_MODE_OPTIONS.map((d) => d.id);
+            this._favoritedMap = await batchCheckFavorited(ids);
+            const currentId = this.data.worksheetId;
+            if (this._favoritedMap[currentId]) {
+                this.setData({ isPreviewFavorite: true });
+            }
+        },
+
         getPublishMeta(): DebugPublishMeta {
             const meta = getPublishMetaByMode(this.data.worksheetId);
             if (!meta) {
@@ -358,7 +376,7 @@ createPage(
                     worksheetId,
                     functionId: worksheetId,
                     traceMode,
-                    isPreviewFavorite: false,
+                    isPreviewFavorite: !!this._favoritedMap[worksheetId],
                     selectedLetter,
                     selectedLetterPair: `${selectedLetter}${selectedLetter.toLowerCase()}`,
                     letterCaseLower,