Fix add button. Fix hotkeys in settings. Add Workspace hotkeys

Downterm/CommandNotch/Models/AppSettings.swift

@@ -56,6 +56,8 @@ struct AppSettings: Equatable, Codable {
             closeTab: .cmdW,
             nextTab: .cmdShiftRB,
             previousTab: .cmdShiftLB,
+            nextWorkspace: .cmdShiftDown,
+            previousWorkspace: .cmdShiftUp,
             detachTab: .cmdD
         )
     )
@@ -121,6 +123,8 @@ extension AppSettings {
         var closeTab: HotkeyBinding
         var nextTab: HotkeyBinding
         var previousTab: HotkeyBinding
+        var nextWorkspace: HotkeyBinding
+        var previousWorkspace: HotkeyBinding
         var detachTab: HotkeyBinding
     }
 }