处理AI回复问题

CustomKeyboard/Network/KBStreamFetcher.m

@@ -288,6 +288,13 @@ static NSUInteger kb_validUTF8PrefixLen(NSData *data) {
 
 - (void)emitChunk:(NSString *)rawText {
     if (rawText.length == 0) return;
+    // 调试：在任何处理之前打印后端“原始文本分片”，便于对照排查
+    if (self.loggingEnabled) {
+        NSLog(@"[KBStream] RAW chunk#%ld len=%lu text=\"%@\"",
+              (long)(self.emittedChunkCount + 1),
+              (unsigned long)rawText.length,
+              KBPrintableSnippet(rawText, 160));
+    }
     NSString *text = rawText;
     // 0) 规范化换行与段起始：去掉位于片段开头的 \r/\n；将 "\n\t"、"\r\n\t"、"\r\t" 归一为 "\t"
     text = [text stringByReplacingOccurrencesOfString:@"\r\n\t" withString:@"\t"];