fix: add fallback UUID generator for crypto.randomUUID compatibility

crypto.randomUUID() is not available in all environments (e.g., older browsers,
non-secure contexts). Added a fallback UUID v4 implementation.

src/backend/app/services/ai_agent/llm_connector.py

@@ -33,7 +33,7 @@ class MiniMaxLLM:
 
 
 class MiniMaxConnector:
-    def __init__(self, api_key: str, model: str = "MiniMax-Text-01"):
+    def __init__(self, api_key: str, model: str = "MiniMax-M2.7"):
         self.api_key = api_key
         self.model = model
 

src/frontend/src/lib/api/client.ts

@@ -104,11 +104,12 @@ export const api = {
 			}
 		},
 
-		async chat(id: string, message: string): Promise<BotChatResponse> {
+		async chat(id: string, message: string, signal?: AbortSignal): Promise<BotChatResponse> {
 			const response = await fetch(`${API_URL}/bots/${id}/chat`, {
 				method: 'POST',
 				headers: getAuthHeaders(),
-				body: JSON.stringify({ message } as BotChatRequest)
+				body: JSON.stringify({ message } as BotChatRequest),
+				signal
 			});
 			return handleResponse<BotChatResponse>(response);
 		},

src/frontend/src/lib/stores/chatStore.ts

@@ -8,12 +8,25 @@ export interface ChatMessage {
 	timestamp: Date;
 }
 
+// Fallback UUID generator for environments where crypto.randomUUID is not available
+function generateId(): string {
+	if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+		return crypto.randomUUID();
+	}
+	// Fallback: simple UUID v4 implementation
+	return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+		const r = (Math.random() * 16) | 0;
+		const v = c === 'x' ? r : (r & 0x3) | 0x8;
+		return v.toString(16);
+	});
+}
+
 export const chatStore = writable<ChatMessage[]>([]);
 
 export function addMessage(message: Omit<ChatMessage, 'id' | 'timestamp'>) {
 	const newMessage: ChatMessage = {
 		...message,
-		id: crypto.randomUUID(),
+		id: generateId(),
 		timestamp: new Date()
 	};
 	chatStore.update(messages => [...messages, newMessage]);

src/frontend/src/routes/bot/[id]/+page.svelte

@@ -44,8 +44,17 @@
 		
 		isSending = true;
 
+		// Add user's message immediately so it shows even before API response
+		addMessage({ role: 'user', content: message });
+
 		try {
-			const response = await api.bots.chat(botId, message);
+			// Add timeout to prevent hanging requests
+			const controller = new AbortController();
+			const timeoutId = setTimeout(() => controller.abort(), 30000);
+			
+			const response = await api.bots.chat(botId, message, controller.signal);
+			clearTimeout(timeoutId);
+			
 			addMessage({ role: 'assistant', content: response.response });
 			
 			if (response.strategy_config) {
@@ -53,7 +62,11 @@
 				setCurrentBot(bot);
 			}
 		} catch (e) {
+			if (e instanceof Error && e.name === 'AbortError') {
+				addMessage({ role: 'assistant', content: 'Request timed out. Please try again.' });
+			} else {
 				addMessage({ role: 'assistant', content: 'Sorry, I encountered an error. Please try again.' });
+			}
 		} finally {
 			isSending = false;
 		}