feat(chat): update custom agent chat and input section #51

- Update CustomAgentChatProcessor.kt:
  - Replace the local message with the modified content without surrounding quotes.
  - Re-render the assistant output message.
  - Update the UI.

- Update AutoDevInputSection.kt:
  - Instead of updating the state property of CustomAgentConfig, assign the new state directly.

This commit adds improvements to the custom agent chat processor and input section in the chat feature.

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

@@ -48,7 +48,8 @@ class CustomAgentChatProcessor(val project: Project) {
                     sb.append(result)
                 }
 
-                llmProvider.appendLocalMessage(sb.toString(), ChatRole.Assistant)
+                val content = sb.toString().removeSurrounding("\"")
+                llmProvider.appendLocalMessage(content, ChatRole.Assistant)
                 message.reRenderAssistantOutput()
                 ui.hiddenProgressBar()
                 ui.updateUI()

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

@@ -315,8 +315,8 @@ class AutoDevInputSection(private val project: Project, val disposable: Disposab
     }
 
     fun resetAgent() {
-        (customRag.selectedItem as? CustomAgentConfig)?.state.let {
-            CustomAgentState.START
+        (customRag.selectedItem as? CustomAgentConfig)?.let {
+            it.state = CustomAgentState.START
         }
 
         customRag.selectedItem = defaultRag