add os detection

client/ui/frontend/src/lib/platform.ts

@@ -0,0 +1,44 @@
+import { System } from "@wailsio/runtime";
+
+export type Platform = {
+  isWindows11: boolean;
+  isMacOS: boolean;
+  isOtherOS: boolean;
+};
+
+let cached: Platform | null = null;
+
+// Windows 11 is Windows NT 10.0 with build number >= 22000.
+function parseWindows11(version: string): boolean {
+  const match = version.match(/(\d+)\.(\d+)\.(\d+)/);
+  if (!match) return false;
+  return parseInt(match[3], 10) >= 22000;
+}
+
+export async function initPlatform(): Promise<void> {
+  if (cached) return;
+  const isMacOS = System.IsMac();
+  const isWindows = System.IsWindows();
+  let isWindows11 = false;
+  if (isWindows) {
+    const env = await System.Environment();
+    isWindows11 = parseWindows11(env.OSInfo?.Version ?? "");
+  }
+  cached = {
+    isWindows11,
+    isMacOS,
+    isOtherOS: !isMacOS && !isWindows11,
+  };
+}
+
+function get(): Platform {
+  if (!cached) {
+    throw new Error("platform: initPlatform() must complete before sync getters are used");
+  }
+  return cached;
+}
+
+export const getPlatform = (): Platform => get();
+export const isWindows11 = (): boolean => get().isWindows11;
+export const isMacOS = (): boolean => get().isMacOS;
+export const isOtherOS = (): boolean => get().isOtherOS;