Add loading spinners for async operations

internal/tui/screens/detail.go

@@ -144,6 +144,12 @@ func (s *DetailScreen) View() string {
 
 // renderContent renders the main detail screen content
 func (s *DetailScreen) renderContent() string {
+	// Breadcrumb: Clients > Client Name
+	breadcrumb := components.RenderBreadcrumb([]components.BreadcrumbItem{
+		{Label: "Clients", ID: "list"},
+		{Label: s.client.Name, ID: "detail"},
+	})
+
 	statusText := s.status
 	if s.status == wireguard.StatusConnected {
 		statusText = theme.StyleSuccess.Bold(true).Render("● " + s.status)
@@ -154,6 +160,8 @@ func (s *DetailScreen) renderContent() string {
 	// Build content
 	content := lipgloss.JoinVertical(
 		lipgloss.Left,
+		breadcrumb,
+		"",
 		theme.StyleTitle.Render(fmt.Sprintf("Client Details: %s", s.client.Name)),
 		"",
 		s.renderField("Status", statusText),