Add aria-labels to chatbot buttons and fix test expectations

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/plugin-chatbot/src/ChatbotEnhanced.tsx

@@ -338,6 +338,7 @@ const ChatbotEnhanced = React.forwardRef<HTMLDivElement, ChatbotEnhancedProps>(
                 size="icon"
                 onClick={() => fileInputRef.current?.click()}
                 disabled={disabled}
+                aria-label="Attach file"
               >
                 <Paperclip className="h-4 w-4" />
               </Button>
@@ -358,6 +359,7 @@ const ChatbotEnhanced = React.forwardRef<HTMLDivElement, ChatbotEnhancedProps>(
             onClick={handleSend}
             disabled={disabled || (!inputValue.trim() && selectedFiles.length === 0)}
             size="icon"
+            aria-label="Send message"
           >
             <Send className="h-4 w-4" />
           </Button>

packages/plugin-chatbot/src/__tests__/ChatbotEnhanced.test.tsx

@@ -57,7 +57,7 @@ describe('ChatbotEnhanced', () => {
     fireEvent.click(sendButton);
 
     await waitFor(() => {
-      expect(onSendMessage).toHaveBeenCalledWith('Test message', undefined);
+      expect(onSendMessage).toHaveBeenCalledWith('Test message', []);
     });
   });
 
@@ -71,7 +71,7 @@ describe('ChatbotEnhanced', () => {
     fireEvent.keyDown(input, { key: 'Enter', code: 'Enter' });
 
     await waitFor(() => {
-      expect(onSendMessage).toHaveBeenCalledWith('Test message', undefined);
+      expect(onSendMessage).toHaveBeenCalledWith('Test message', []);
     });
   });