refactor: navegacion consistente con HandleBack en todas las vistas

Cada vista expone HandleBack() bool que retrocede un nivel interno (logs ->
lista) o indica que esta en estado base. El model principal intercepta q/0/esc
y delega a HandleBack: si retorna true, sale de la TUI; si false, la vista
retrocedio internamente. Elimina manejo duplicado de esc/q/0 en sub-estados.

fn_operations/docker_tui/app/model.go

@@ -53,6 +53,12 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		switch msg.String() {
 		case views.KeyQuit:
 			return m, tea.Quit
+		case "q", "0", "esc":
+			updated, atBase := m.handleBack()
+			if atBase {
+				return updated, tea.Quit
+			}
+			return updated, nil
 		case views.KeyTab:
 			m.activeTab = (m.activeTab + 1) % len(tabNames)
 			return m, m.initActiveView()
@@ -129,6 +135,29 @@ func (m Model) renderTabs() string {
 	return m.Styles.Header.Render("Docker TUI") + "  " + row
 }
 
+// handleBack asks the active view to go back one level.
+// Returns the updated model and true if the view was already at base level (app should quit).
+func (m Model) handleBack() (Model, bool) {
+	switch View(m.activeTab) {
+	case ViewContainers:
+		atBase := m.containers.HandleBack()
+		return m, atBase
+	case ViewImages:
+		atBase := m.images.HandleBack()
+		return m, atBase
+	case ViewVolumes:
+		atBase := m.volumes.HandleBack()
+		return m, atBase
+	case ViewNetworks:
+		atBase := m.networks.HandleBack()
+		return m, atBase
+	case ViewCompose:
+		atBase := m.compose.HandleBack()
+		return m, atBase
+	}
+	return m, true
+}
+
 func (m Model) initActiveView() tea.Cmd {
 	switch View(m.activeTab) {
 	case ViewContainers: