iso: improve burn-in, export, and live boot

audit/internal/tui/screen_main.go

@@ -8,7 +8,9 @@ func (m model) handleMainMenu() (tea.Model, tea.Cmd) {
 	switch m.cursor {
 	case 0: // Health Check
 		return m.enterHealthCheck()
-	case 1: // Export support bundle
+	case 1: // Burn-in tests
+		return m.enterBurnInTests()
+	case 2: // Export support bundle
 		m.pendingAction = actionExportBundle
 		m.busy = true
 		m.busyTitle = "Export support bundle"
@@ -16,11 +18,11 @@ func (m model) handleMainMenu() (tea.Model, tea.Cmd) {
 			targets, err := m.app.ListRemovableTargets()
 			return exportTargetsMsg{targets: targets, err: err}
 		}
-	case 2: // Settings
+	case 3: // Settings
 		m.screen = screenSettings
 		m.cursor = 0
 		return m, nil
-	case 3: // Exit
+	case 4: // Exit
 		return m, tea.Quit
 	}
 	return m, nil