implemented /clear and Ctrl+D and thinking

llm.go

@@ -148,6 +148,7 @@ func (s *standardLLMClient) handleStream(body io.ReadCloser, streamCallback,
   reasoningCallback func(string)) (Message, error) {
   defer body.Close()
   var fullContent strings.Builder
+  var fullReasoning strings.Builder
   var finalMsg Message
   finalMsg.Role = MessageRoleAssistant
 
@@ -178,14 +179,26 @@ func (s *standardLLMClient) handleStream(body io.ReadCloser, streamCallback,
     var chunk struct {
       Choices []struct {
         Delta struct {
-          Content   string          `json:"content"`
-          ToolCalls []deltaToolCall `json:"tool_calls"`
+          Content          string          `json:"content"`
+          ReasoningContent string          `json:"reasoning_content"`
+          Reasoning        string          `json:"reasoning"`
+          ToolCalls        []deltaToolCall `json:"tool_calls"`
         } `json:"delta"`
       } `json:"choices"`
     }
     if err := json.Unmarshal([]byte(data), &chunk); err == nil && len(chunk.Choices) > 0 {
       delta := chunk.Choices[0].Delta
-      if delta.Content != "" {
+
+      rContent := delta.ReasoningContent
+      if rContent == "" {
+        rContent = delta.Reasoning
+      }
+      if rContent != "" && reasoningCallback != nil {
+        fullReasoning.WriteString(rContent)
+        reasoningCallback(rContent)
+      }
+
+      if delta.Content != "" && streamCallback != nil {
         fullContent.WriteString(delta.Content)
         streamCallback(delta.Content)
       }
@@ -206,6 +219,7 @@ func (s *standardLLMClient) handleStream(body io.ReadCloser, streamCallback,
   }
 
   finalMsg.Content = fullContent.String()
+  finalMsg.Reasoning = fullReasoning.String()
   if maxIndex >= 0 {
     for i := 0; i <= maxIndex; i++ {
       if tc, ok := toolCallsMap[i]; ok {