Fix HTML release asset download (#1578)

lib/pages/app.dart

@@ -175,9 +175,8 @@ class _AppPageState extends State<AppPage> {
                 tr('downloadX', args: [tr('releaseAsset').toLowerCase()]),
                 textAlign: TextAlign.center,
                 style: Theme.of(context).textTheme.labelSmall!.copyWith(
-                      decoration:
-                          changeLogFn != null ? TextDecoration.underline : null,
-                      fontStyle: changeLogFn != null ? FontStyle.italic : null,
+                      decoration: TextDecoration.underline,
+                      fontStyle: FontStyle.italic,
                     ),
               ),
             ),

lib/providers/apps_provider.dart

@@ -223,6 +223,7 @@ Future<File> downloadFile(String url, String fileName, bool fileNameHasExt,
   if (url.toLowerCase().endsWith('.apk') && ext != 'apk') {
     ext = 'apk';
   }
+  fileName = fileName.split('/').last; // Ensure the fileName is a file name
   File downloadedFile = File('$destDir/$fileName.$ext');
   if (fileNameHasExt) {
     // If the user says the filename already has an ext, ignore whatever you inferred from above