feat: initial ui redesign from demo

src/ui/lib/electron.ts

@@ -0,0 +1,18 @@
+type ElectronWindow = Window &
+  typeof globalThis & {
+    IS_ELECTRON?: boolean;
+    electronAPI?: {
+      isElectron?: boolean;
+    };
+  };
+
+export function isElectron(): boolean {
+  if (typeof window === "undefined") return false;
+
+  const win = window as ElectronWindow;
+  const hasISElectron = win.IS_ELECTRON === true;
+  const hasElectronAPI = !!win.electronAPI;
+  const isElectronProp = win.electronAPI?.isElectron === true;
+
+  return hasISElectron || hasElectronAPI || isElectronProp;
+}