Fix frozen spinner during MCP tool loading

The ToolsetInfoEvent handler called sidebar.SetToolsetInfo() directly and returned nil, bypassing the sidebar's Update() method which starts the spinner animation. Forward the event via forwardToSidebar() so the spinner registers with the animation coordinator and animates properly.

Assisted-By: docker-agent

Author: dgageot

pkg/tui/page/chat/runtime_events.go

@@ -120,9 +120,8 @@ func (p *chatPage) handleRuntimeEvent(msg tea.Msg) (bool, tea.Cmd) {
 		return true, nil
 
 	case *runtime.ToolsetInfoEvent:
-		p.sidebar.SetToolsetInfo(msg.AvailableTools, msg.Loading)
 		p.sidebar.SetSkillsInfo(len(p.app.CurrentAgentSkills()))
-		return true, nil
+		return true, p.forwardToSidebar(msg)
 
 	case *runtime.SessionTitleEvent:
 		return true, p.forwardToSidebar(msg)