feat: 完成三类字母描红开发

miniprogram/core/data/worksheets.ts

@@ -325,7 +325,7 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
         {
             id: 'letter-tracing-upper-lower',
             title: '字母总览',
-            desc: 'Uppercase / Lowercase 分区，9+9+8 行',
+            desc: 'Uppercase / Lowercase 分区，每区四行（7+7+6+6）',
             category: 'english',
             page: 'letterTracing',
             subpackage: 'englishPages',
@@ -387,6 +387,72 @@ export const ALL_WORKSHEETS: WorksheetDefinition[] = [
             },
         },
     ),
+    sheet(
+        {
+            id: 'letter-tracing-triple',
+            title: '三字母精练',
+            desc: '每页聚焦 3 个字母，大写 + 小写深度书写',
+            category: 'english',
+            page: 'letterTracing',
+            subpackage: 'englishPages',
+            icon: '🔤',
+            img: '',
+            ageRange: [4, 7],
+            difficulty: 'basic',
+            previewBg: '#e8f4ff',
+            previewText: 'ABC',
+        },
+        {
+            subcategory: 'letter-tracing',
+            template: 'tracing-writing',
+            generator: 'letter-tracing',
+            sortOrder: 46,
+            layoutConfig: {
+                ...L.trace,
+                instructionText: '每页 3 个字母，逐字精练',
+            },
+            generatorConfig: {
+                mode: 'triple-focus',
+                letterCase: 'both',
+                repetitions: 5,
+                fadePattern: 'gradient',
+                tripleLetters: ['A', 'B', 'C'],
+            },
+        },
+    ),
+    sheet(
+        {
+            id: 'letter-tracing-single-line',
+            title: '单字母逐行',
+            desc: '每行一个字母，13 字母半表逐字练习',
+            category: 'english',
+            page: 'letterTracing',
+            subpackage: 'englishPages',
+            icon: '📝',
+            img: '',
+            ageRange: [4, 7],
+            difficulty: 'basic',
+            previewBg: '#e8f4ff',
+            previewText: 'A–M',
+        },
+        {
+            subcategory: 'letter-tracing',
+            template: 'tracing-writing',
+            generator: 'letter-tracing',
+            sortOrder: 47,
+            layoutConfig: {
+                ...L.trace,
+                instructionText: '每行一个字母，逐字反复练习',
+            },
+            generatorConfig: {
+                mode: 'single-line',
+                letterCase: 'both',
+                alphabetHalf: 'A-M',
+                repetitions: 5,
+                fadePattern: 'first-only',
+            },
+        },
+    ),
 ];
 
 export const MATH_FUNCTION_TYPES: MathFunctionType[] = ALL_WORKSHEETS.filter(