feat(a11y): expose Settings navigation and file-tree rows; title the Settings window

Settings sections are tabs with their names and selected state, file-tree
rows are tree items named by file with selection and expansion, and the
Settings window carries a title for VoiceOver and the Window menu.

src/ui/file_tree.rs

@@ -2008,6 +2008,14 @@ impl Tty7App {
         });
         let row_el = h_flex()
             .id(SharedString::from(format!("tree-{}", path.display())))
+            .role(gpui::Role::TreeItem)
+            .aria_label(SharedString::from(
+                path.file_name()
+                    .map(|n| n.to_string_lossy().into_owned())
+                    .unwrap_or_else(|| path.display().to_string()),
+            ))
+            .aria_selected(selected)
+            .when(is_dir, |r| r.aria_expanded(row.expanded))
             .items_center()
             .gap(px(TREE_GAP))
             .h(px(TREE_ROW_H))

src/ui/i18n/en.rs

@@ -266,6 +266,7 @@ pub fn translate_en(key: L10nKey) -> &'static str {
         L10nKey::SettingsNavKeybindings => "Keyboard shortcuts",
         L10nKey::SettingsNavAbout => "About",
         L10nKey::SettingsHeader => "SETTINGS",
+        L10nKey::SettingsWindowTitle => "Settings",
         L10nKey::Reset => "Reset",
         L10nKey::Save => "Save",
         L10nKey::Connect => "Connect",

src/ui/i18n/ja.rs

@@ -283,6 +283,7 @@ pub fn translate_ja(key: L10nKey) -> Option<&'static str> {
         L10nKey::SettingsNavKeybindings => "キーボードショートカット",
         L10nKey::SettingsNavAbout => "情報",
         L10nKey::SettingsHeader => "設定",
+        L10nKey::SettingsWindowTitle => "設定",
         L10nKey::Reset => "リセット",
         L10nKey::Save => "保存",
         L10nKey::Connect => "接続",

src/ui/i18n/mod.rs

@@ -292,6 +292,7 @@ l10n_keys! {
     SettingsNavKeybindings,
     SettingsNavAbout,
     SettingsHeader,
+    SettingsWindowTitle,
     Reset,
     Save,
     Connect,

src/ui/i18n/zh.rs

@@ -239,6 +239,7 @@ pub fn translate_zh(key: L10nKey) -> Option<&'static str> {
         L10nKey::SettingsNavKeybindings => "快捷键",
         L10nKey::SettingsNavAbout => "关于",
         L10nKey::SettingsHeader => "设置",
+        L10nKey::SettingsWindowTitle => "设置",
         L10nKey::Reset => "重置",
         L10nKey::Save => "保存",
         L10nKey::Connect => "连接",

src/ui/settings/shell.rs

@@ -1140,6 +1140,9 @@ impl Tty7App {
                     "settings-nav-{}",
                     target.profile_label()
                 )))
+                .role(gpui::Role::Tab)
+                .aria_label(t(target.title()))
+                .aria_selected(active)
                 .h(px(28.))
                 .px(px(8.))
                 .gap(px(10.))

src/ui/settings_window.rs

@@ -30,6 +30,9 @@ pub(crate) fn window_options(cx: &mut App) -> WindowOptions {
         ))),
         app_id: Some("tty7".to_owned()),
         titlebar: Some(TitlebarOptions {
+            // Not drawn (the title bar is the window's own), but it is the
+            // name the Window menu, Mission Control and VoiceOver give it.
+            title: Some(crate::ui::i18n::t(crate::ui::i18n::L10nKey::SettingsWindowTitle).into()),
             traffic_light_position: Some(crate::ui::theme::traffic_light_position()),
             ..TitleBar::title_bar_options()
         }),