fix: restore PWA install button visibility

src/components/Layout/TopBarNew.jsx

@@ -543,16 +543,14 @@ export default function TopBarNew({ theme = "dark", onChangeTheme, onIslandsClic
             onClick={() => authenticated && onUserIsland?.(username)}
           />
 
-          {/* PWA Install - hide on very small screens */}
+          {/* PWA Install */}
           {showInstallBtn && (
-            <div className="hidden xs:block">
-              <ActionButton
-                icon="fa-solid fa-download"
-                color="purple"
-                onClick={() => promptInstall()}
-                title={t('topbar.installApp')}
-              />
-            </div>
+            <ActionButton
+              icon="fa-solid fa-download"
+              color="purple"
+              onClick={() => promptInstall()}
+              title={t('topbar.installApp')}
+            />
           )}
 
           {/* Theme - mobile only */}