feat(i18n): add package-level clear handlers

Co-Authored-By: Virgil <virgil@lethean.io>

i18n.go

@@ -122,6 +122,13 @@ func PrependHandler(handlers ...KeyHandler) {
 	}
 }
 
+// ClearHandlers removes all handlers from the default service.
+func ClearHandlers() {
+	if svc := Default(); svc != nil {
+		svc.ClearHandlers()
+	}
+}
+
 func executeIntentTemplate(tmplStr string, data templateData) string {
 	if tmplStr == "" {
 		return ""

i18n_test.go

@@ -250,6 +250,23 @@ func TestPrependHandler_Good_Variadic(t *testing.T) {
 	assert.IsType(t, ProgressHandler{}, handlers[1])
 }
 
+func TestClearHandlers_Good(t *testing.T) {
+	svc, err := New()
+	require.NoError(t, err)
+	_ = Init()
+	prev := Default()
+	SetDefault(svc)
+	t.Cleanup(func() {
+		SetDefault(prev)
+	})
+
+	AddHandler(LabelHandler{})
+	require.NotEmpty(t, svc.Handlers())
+
+	ClearHandlers()
+	assert.Empty(t, svc.Handlers())
+}
+
 // --- executeIntentTemplate ---
 
 func TestExecuteIntentTemplate_Good(t *testing.T) {