sideright: hide night light button when unavailable

.config/ags/modules/sideright/quicktoggles.js

@@ -78,7 +78,9 @@ export const HyprToggleIcon = async (icon, name, hyprlandConfigValue, props = {}
     }
 }
 
-export const ModuleNightLight = (props = {}) => Widget.Button({
+export const ModuleNightLight = async (props = {}) => {
+    if (!exec(`bash -c 'command -v gammastep'`)) return null;
+    return Widget.Button({
         attribute: {
             enabled: false,
         },
@@ -109,7 +111,8 @@ export const ModuleNightLight = (props = {}) => Widget.Button({
             self.toggleClassName('sidebar-button-active', self.attribute.enabled);
         },
         ...props,
-});
+    });
+}
 
 export const ModuleInvertColors = async (props = {}) => {
     try {

.config/ags/modules/sideright/sideright.js

@@ -90,7 +90,7 @@ const togglesBox = Widget.Box({
         ToggleIconBluetooth(),
         await ModuleRawInput(),
         await HyprToggleIcon('touchpad_mouse', 'No touchpad while typing', 'input:touchpad:disable_while_typing', {}),
-        ModuleNightLight(),
+        await ModuleNightLight(),
         await ModuleInvertColors(),
         ModuleIdleInhibitor(),
     ]