fix(native): reread the patch notes when the interface language changes

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- **What's new follows a language you switch to.** In the native window, the
+  release notes stayed in the language they were first read in after you
+  changed the interface language, under group names in the new one.
+
 ## [0.70.0] - 2026-10-17
 
 ### Added

native/cmd/lich-native/settings_language.go

@@ -146,6 +146,7 @@ func (s *settingsScreen) chooseLanguage(l i18n.Locale) {
 func (s *settingsScreen) keepLanguage(l i18n.Locale) {
 	i18n.SetCurrent(l)
 	s.invalidate()
+	go s.updates.readNotes(s)
 	go func() {
 		if err := s.client.SetSetting(s.ctx, uiLanguageKey, "", string(l)); err != nil {
 			log.Printf("settings: save %s: %v", uiLanguageKey, err)

native/cmd/lich-native/settings_language_test.go

@@ -190,3 +190,17 @@ func TestAFailedOrCanceledDownloadKeepsTheLanguage(t *testing.T) {
 		t.Errorf("current %s", i18n.Current())
 	}
 }
+
+// The notes are read once and kept; a new interface language reads them
+// again, or the dialog names its groups in one language and lists them in
+// the other.
+func TestChoosingALanguageRereadsThePatchNotes(t *testing.T) {
+	s := languageScreen(t)
+	s.updates.readNotes(s)
+	s.keepLanguage(i18n.RU)
+	eventually(t, "the notes in Russian", func() bool {
+		s.updates.mu.Lock()
+		defer s.updates.mu.Unlock()
+		return s.updates.notes.Groups[0].Items[0] == string(i18n.RU)
+	})
+}

native/cmd/lich-native/sidebar_prefs_test.go

@@ -72,6 +72,8 @@ func (f *sidebarBackend) answer(method string, args []json.RawMessage) any {
 		_ = json.Unmarshal(args[0], &opts)
 		f.settings["appearance.theme@"] = opts.ID
 		return nil
+	case "patchnotes.Current":
+		return lichclient.PatchNotes{Version: "1.0.0", Groups: []lichclient.PatchNotesGroup{{Label: "Added", Items: []string{str(0)}}}}
 	case "themes.SetFollowSystem":
 		f.settings["appearance.followSystem@"] = string(args[0])
 		return nil