fix(ocr): correctly load data from API

Also for some reason eng traineddata were missing in the app, hopefully fixed by this

lib/network/tessdata.dart

@@ -11,21 +11,22 @@ class TessdataApi {
   static final Dio _client = Dio(
     BaseOptions(
       validateStatus: (status) => true,
+      headers: {"User-Agent": "prasule/1.0.0"},
     ),
   );
 
   /// Gets available languages from the repo
   static Future<List<String>> getAvailableData() async {
-    final res = await _client.get<List<Map<String, dynamic>>>(
+    final res = await _client.get<List<dynamic>>(
       "https://git.mnau.xyz/api/v1/repos/hernik/tessdata_fast/contents",
       options: Options(headers: {"Accept": "application/json"}),
     );
     if ((res.statusCode ?? 500) > 399) {
       return Future.error("The server returned status code ${res.statusCode}");
     }
-    final data = res.data;
+    final data = List<Map<String, dynamic>>.from(res.data ?? []);
     final dataFiles = <String>[];
-    for (final file in data ?? <Map<String, dynamic>>[]) {
+    for (final file in data) {
       if (!(file["name"] as String).endsWith(".traineddata")) continue;
       dataFiles.add((file["name"] as String).replaceAll(".traineddata", ""));
     }

lib/views/home.dart

@@ -472,12 +472,13 @@ class _HomeViewState extends State<HomeView> {
             PlatformButton(
               text: AppLocalizations.of(context).download,
               onPressed: () {
-                Navigator.of(context).push(
-                  platformRoute(
-                    (c) => const TessdataListView(),
-                  ),
-                );
-                Navigator.of(c).pop();
+                Navigator.of(context)
+                    .push(
+                      platformRoute(
+                        (c) => const TessdataListView(),
+                      ),
+                    )
+                    .then((value) => Navigator.of(c).pop());
               },
             ),
             PlatformButton(

pubspec.yaml

@@ -84,8 +84,8 @@ flutter:
   # the material Icons class.
   uses-material-design: true
   assets:
-    - assets/
-    - assets/tessdata/
+    - assets/tessdata_config.json
+    - assets/tessdata/eng.traineddata
   # To add assets to your application, add an assets section, like this:
   # assets:
   #   - images/a_dot_burr.jpeg