fix(chat): handle index not ready exception with notification

Add a warning notification when the index is not ready during code completion to improve user feedback.

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/actions/chat/CodeCompleteChatAction.kt

@@ -1,5 +1,6 @@
 package cc.unitmesh.devti.actions.chat
 
+import cc.unitmesh.devti.AutoDevNotifications
 import cc.unitmesh.devti.gui.AutoDevToolWindowFactory
 import cc.unitmesh.devti.gui.chat.message.ChatActionType
 import cc.unitmesh.devti.gui.chat.NormalChatCodingPanel
@@ -75,6 +76,7 @@ class CodeCompleteChatAction : AnAction() {
                     chatCodingService.handlePromptAndResponse(contentPanel, prompter, chatContext, true)
                 }
             } catch (ignore: IndexNotReadyException) {
+                AutoDevNotifications.warn(project, "Index not ready")
                 return@runReadAction
             }
         }