feat: 汉字每日打卡页面优化

miniprogram/core/data/words.ts

@@ -255,3 +255,22 @@ export const WORDS = [
         words: ['个', '只', '匹', '条', '朵', '棵', '片', '张', '本', '杯', '块', '双'],
     },
 ];
+
+/** 将 categoryId 转为 word-picker / van-tabs 使用的数组下标 */
+export function getCategoryTabIndex(categoryId: number): number {
+    const index = WORDS.findIndex((cat) => cat.categoryId === categoryId);
+    return index >= 0 ? index : 0;
+}
+
+/** 汇总分类下全部汉字（含一二年级 sections） */
+export function collectCategoryWords(
+    cat: (typeof WORDS)[number],
+): string[] {
+    if (cat.words?.length) {
+        return cat.words;
+    }
+    if (cat.sections?.length) {
+        return cat.sections.flatMap((section) => section.words);
+    }
+    return [];
+}