feat: alphabet sort order, non-ascii appears first

字母排序顺序调整：

0. 读音首字母相同则在同一组内，否则按读音首字母排序
1. 同组内，显示名称首个字符为非字母的，优先显示
2. 上述前提下，按读音进行排序

Log:

src/models/categorizedsortproxymodel.cpp

@@ -58,11 +58,25 @@ bool CategorizedSortProxyModel::lessThan(const QModelIndex &source_left, const Q
     if (sortRole() == AppsModel::TransliteratedRole) {
         QString l_transliterated = source_left.model()->data(source_left, sortRole()).toString();
         QString r_transliterated = source_right.model()->data(source_right, sortRole()).toString();
-        QString l_prepend = l_transliterated.isEmpty() ? QString() : l_transliterated.constData()[0].toUpper();
-        QString r_prepend = r_transliterated.isEmpty() ? QString() : r_transliterated.constData()[0].toUpper();
-        QString l_concat = l_prepend + source_left.model()->data(source_left, Qt::DisplayRole).toString();
-        QString r_concat = r_prepend + source_right.model()->data(source_right, Qt::DisplayRole).toString();
-        return l_concat < r_concat;
+        QChar l_start = l_transliterated.isEmpty() ? QChar() : l_transliterated.constData()[0].toUpper();
+        QChar r_start = r_transliterated.isEmpty() ? QChar() : r_transliterated.constData()[0].toUpper();
+        if (l_start != r_start) {
+            return l_start < r_start;
+        } else {
+            QString l_display = source_left.model()->data(source_left, Qt::DisplayRole).toString();
+            QString r_display = source_right.model()->data(source_right, Qt::DisplayRole).toString();
+            QChar ld_start = l_display.isEmpty() ? QChar() : l_display.constData()[0].toUpper();
+            QChar rd_start = r_display.isEmpty() ? QChar() : r_display.constData()[0].toUpper();
+            if ((l_start == ld_start && ld_start == rd_start) || (l_start != ld_start && l_start != rd_start)) {
+                // display name both start with ascii letter, or both NOT start with ascii letter
+                // use their transliterated form for sorting
+                return l_transliterated < r_transliterated;
+            } else {
+                // one of them are ascii letter and another of them is non-ascii letter.
+                // the non-ascii one should be display on the front
+                return l_start != ld_start;
+            }
+        }
     }
 
     return QSortFilterProxyModel::lessThan(source_left, source_right);