Remove spaces between Chinese and English text

- Add post-processing to remove spaces between Chinese and alphanumeric characters
- Update mergeTexts comment to reflect current behavior

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ZhaoChaoqun

Sources/RecordingManager.swift

@@ -192,7 +192,7 @@ class RecordingManager {
             }
         }
 
-        // 无重叠，直接拼接（无空格，因为中文不需要）
+        // 无重叠，信任模型输出的标点，直接拼接
         return existing + new
     }
 

Sources/SherpaOnnxRecognizer.swift

@@ -83,6 +83,11 @@ class SherpaOnnxRecognizer {
         // 过滤 FunASR 特殊标记（如 <|nospeech|>, <|HAPPY|>, <|en|> 等）
         var text = String(cString: textPtr)
         text = text.replacingOccurrences(of: "<\\|[^|]+\\|>", with: "", options: .regularExpression)
+
+        // 移除中文和英文之间的空格
+        text = text.replacingOccurrences(of: "([\\u4e00-\\u9fa5])\\s+([a-zA-Z0-9])", with: "$1$2", options: .regularExpression)
+        text = text.replacingOccurrences(of: "([a-zA-Z0-9])\\s+([\\u4e00-\\u9fa5])", with: "$1$2", options: .regularExpression)
+
         text = text.trimmingCharacters(in: .whitespacesAndNewlines)
         return text.isEmpty ? nil : text
     }