Add themes selector

Downterm/CommandNotch/Views/SettingsView.swift

@@ -265,6 +265,7 @@ struct TerminalSettingsView: View {
 
     @AppStorage(NotchSettings.Keys.terminalFontSize) private var fontSize  = NotchSettings.Defaults.terminalFontSize
     @AppStorage(NotchSettings.Keys.terminalShell)    private var shellPath = NotchSettings.Defaults.terminalShell
+    @AppStorage(NotchSettings.Keys.terminalTheme)    private var theme     = NotchSettings.Defaults.terminalTheme
 
     var body: some View {
         Form {
@@ -275,6 +276,21 @@ struct TerminalSettingsView: View {
                     Text("\(Int(fontSize))pt").monospacedDigit().frame(width: 50)
                 }
             }
+            Section("Colors") {
+                Picker("Theme", selection: $theme) {
+                    ForEach(TerminalTheme.allCases) { terminalTheme in
+                        Text(terminalTheme.label).tag(terminalTheme.rawValue)
+                    }
+                }
+
+                Text(TerminalTheme.resolve(theme).detail)
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+
+                Text("Applies to normal terminal text and the ANSI palette used by tools like `ls`.")
+                    .font(.caption)
+                    .foregroundStyle(.secondary)
+            }
             Section("Shell") {
                 TextField("Shell path (empty = $SHELL)", text: $shellPath)
                     .textFieldStyle(.roundedBorder)