web/device: add global constant for device info

web/src/lib/device.ts

@@ -0,0 +1,13 @@
+const ua = navigator.userAgent.toLowerCase();
+
+const isIOS = ua.includes("iphone os") || (ua.includes("mac os") && navigator.maxTouchPoints > 0);
+const isAndroid = ua.includes("android") || ua.includes("diordna");
+const isMobile = isIOS || isAndroid;
+
+const deviceInfo = {
+    isIOS,
+    isAndroid,
+    isMobile,
+}
+
+export default deviceInfo;