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/test/review_feedback_test.dart

@@ -79,4 +79,31 @@ void main() {
       isTrue,
     );
   });
+
+  test('ignores multiple spaces and casing across review items', () {
+    // Multi-space and uppercase on A0-P03
+    expect(
+      ReviewFeedback.check(
+        review('A0-P03', 'Nice to meet you.'),
+        '   NICE    TO    MEET    YOU!   ',
+      ).complete,
+      isTrue,
+    );
+    // Multi-space and uppercase on A0-P08
+    expect(
+      ReviewFeedback.check(
+        review('A0-P08', 'My number is ...'),
+        'MY   NUMBER   IS   ONE   TWO   THREE',
+      ).complete,
+      isTrue,
+    );
+    // Multi-space on word item
+    expect(
+      ReviewFeedback.check(
+        review('A0-W08', 'three'),
+        '   THREE   ',
+      ).complete,
+      isTrue,
+    );
+  });
 }