feat(chat): add removeLastMessage function to clear chat history #51

This commit introduces a new function `removeLastMessage` to the `ChatCodingPanel` class, which allows clearing the chat history by removing the last message from the component list. The function is guarded by a condition to ensure that the list is not empty before attempting to remove the last message. After removal, the UI is updated to reflect the change.

src/main/kotlin/cc/unitmesh/devti/counit/CustomAgentChatProcessor.kt

@@ -59,6 +59,7 @@ class CustomAgentChatProcessor(val project: Project) {
                         sb.append(it)
                     }
                 }
+                ui.removeLastMessage()
                 ui.setInput(sb.toString())
                 ui.hiddenProgressBar()
             }

src/main/kotlin/cc/unitmesh/devti/gui/chat/ChatCodingPanel.kt

@@ -254,4 +254,12 @@ class ChatCodingPanel(private val chatCodingService: ChatCodingService, val disp
     fun hiddenProgressBar() {
         progressBar.isVisible = false
     }
+
+    fun removeLastMessage() {
+        if (myList.componentCount > 0) {
+            myList.remove(myList.componentCount - 1)
+        }
+
+        updateUI()
+    }
 }