终端主题：浅色、深色外观各选一套，界面切深浅时终端跟着换

- 设置 › 外观新开「终端主题」组，左栏浅色、右栏深色各 10 套内置主题，
  卡片是主题名加一段 ls 示例，选中的整张加底色、右上角蓝底对勾。同一
  主题的浅、深两版在同一行，没有另一版的排最后。应用外观（含跟随系统、
  标题栏按钮）决定用哪一栏。
- 默认 ShellRS Light / Dark：背景、文字、光标、选区和原来一样，16 色
  按 Tailwind 色阶重调，浅色下黄字等不再看不清。第三方主题取自各项目
  自己的终端配色（MIT、Apache-2.0），出处写在源码里。
- 终端格子、边距、选区、链接都取自终端主题；程序查询颜色（OSC 4 / 10
  / 11 / 12）按当前主题回答，不再一律答深色背景。字体和关键字高亮的
  预览也用当前主题。
- 不做自定义主题、导入、按主机指定。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/ui/settings.rs

@@ -318,6 +318,72 @@ fn the_appearance_setting_drives_the_theme_and_the_title_bar_switch(cx: &mut Tes
     .unwrap();
 }
 
+#[gpui_kit::test]
+fn terminal_themes_follow_the_appearance_and_a_card_chooses_one(cx: &mut TestAppContext) {
+    use gpui_kit::component::ThemeMode;
+    use shellrs::terminal::{TerminalColors, TerminalTheme};
+
+    let (handle, workspace) = open_workspace(cx);
+    let settings = cx.update(|cx| workspace.read(cx).settings().clone());
+    let in_effect = |cx: &mut TestAppContext| cx.update(|cx| TerminalColors::current(cx).key());
+    let set_appearance = |appearance, cx: &mut TestAppContext| {
+        cx.update(|cx| {
+            settings.update(cx, |settings, cx| {
+                settings.update(|settings| settings.appearance = appearance, cx)
+            })
+        });
+        cx.run_until_parked();
+    };
+    let card = |theme: &TerminalTheme| {
+        gpui_kit::SharedString::from(format!("terminal-theme-{}", theme.key()))
+    };
+    let light = TerminalTheme::for_mode(ThemeMode::Light).nth(1).unwrap();
+    let dark = TerminalTheme::for_mode(ThemeMode::Dark).nth(1).unwrap();
+
+    set_appearance(Appearance::Light, cx);
+    assert_eq!(in_effect(cx), "shellrs-light");
+    in_frame(cx, handle, |window, cx| window.click("open-settings", cx));
+    // 外观 is the first category; its second group holds both columns.
+    in_frame(cx, handle, |window, cx| {
+        window.within("settings").click("0-0", cx)
+    });
+    in_frame(cx, handle, |window, cx| {
+        assert_eq!(
+            window.find("terminal-theme-shellrs-light").checked(),
+            Some(true)
+        );
+        assert_eq!(
+            window.find("terminal-theme-shellrs-dark").checked(),
+            Some(true)
+        );
+        assert_eq!(window.find(card(light)).checked(), Some(false));
+        window.click(card(light), cx);
+    });
+    cx.update(|cx| {
+        assert_eq!(
+            settings.read(cx).settings().terminal_theme.light,
+            light.key()
+        )
+    });
+    // The light column is the one in effect, so the terminals change now.
+    assert_eq!(in_effect(cx), light.key());
+    in_frame(cx, handle, |window, cx| {
+        assert_eq!(window.find(card(light)).checked(), Some(true));
+        assert_eq!(
+            window.find("terminal-theme-shellrs-light").checked(),
+            Some(false)
+        );
+        window.click(card(dark), cx);
+    });
+    // The dark one waits for the dark appearance.
+    cx.update(|cx| assert_eq!(settings.read(cx).settings().terminal_theme.dark, dark.key()));
+    assert_eq!(in_effect(cx), light.key());
+    set_appearance(Appearance::Dark, cx);
+    assert_eq!(in_effect(cx), dark.key());
+    set_appearance(Appearance::Light, cx);
+    assert_eq!(in_effect(cx), light.key());
+}
+
 /// The 关键字高亮 rules, as the settings hold them.
 fn highlight_rules(
     workspace: &Entity<Workspace>,