fix: 输入校验忽略多个连续空格与大小写；统一中英文引号与空白规范化

kouyu_english/lib/core/review_feedback.dart

@@ -13,13 +13,20 @@ class ReviewCheckResult {
 class ReviewFeedback {
   const ReviewFeedback._();
 
+  static String _normalize(String input) => input
+      .toLowerCase()
+      .replaceAll('’', "'")
+      .replaceAll('‘', "'")
+      .replaceAll(RegExp(r'\s+'), ' ')
+      .trim();
+
   static ReviewCheckResult check(ReviewItem item, String input) {
-    final text = input.toLowerCase().replaceAll('’', "'");
+    final text = _normalize(input);
     final tokens = RegExp(
       r"[a-z]+(?:'[a-z]+)?",
     ).allMatches(text).map((match) => match.group(0)!).toSet();
-    bool has(String token) => tokens.contains(token);
-    bool phrase(String value) => text.contains(value);
+    bool has(String token) => tokens.contains(_normalize(token));
+    bool phrase(String value) => text.contains(_normalize(value));
     bool hasAny(Iterable<String> values) => values.any(has);
     final introduction =
         phrase("i'm") || phrase('i am') || phrase('my name is');
@@ -68,9 +75,8 @@ class ReviewFeedback {
       'A0-P19' => phrase('do you like'),
       'A0-P20' =>
         phrase('please say that again') || phrase('please speak slowly'),
-      _ when item.id.startsWith('A0-W') => tokens.contains(
-        item.target.toLowerCase(),
-      ),
+      _ when item.id.startsWith('A0-W') =>
+        tokens.contains(_normalize(item.target)) || phrase(item.target),
       _ => tokens.length >= 2,
     };
     return ReviewCheckResult(