Fix env save dialog fallback

src/App.tsx

@@ -473,6 +473,20 @@ function openFileWithBrowserPicker(): Promise<{ name: string; content: string }
   });
 }
 
+function saveFileWithBrowserDownload(content: string) {
+  const blob = new Blob([content], { type: "text/plain;charset=utf-8" });
+  const url = URL.createObjectURL(blob);
+  const anchor = document.createElement("a");
+  anchor.href = url;
+  anchor.download = ".env";
+  anchor.style.display = "none";
+
+  document.body.append(anchor);
+  anchor.click();
+  anchor.remove();
+  URL.revokeObjectURL(url);
+}
+
 export default function App() {
   const [input, setInput] = useState("");
   const [loadedPath, setLoadedPath] = useState<string | null>(null);
@@ -534,7 +548,16 @@ export default function App() {
   }
 
   async function saveFile() {
-    await window.envHelper?.saveFile(result.output);
+    try {
+      if (window.envHelper?.saveFile) {
+        await window.envHelper.saveFile(result.output);
+        return;
+      }
+    } catch (error) {
+      console.warn("Native save dialog failed, falling back to browser download.", error);
+    }
+
+    saveFileWithBrowserDownload(result.output);
   }
 
   async function copyOutput() {