Minor improvements

example/lib/screens/export_import/components/path_picker.dart

@@ -71,7 +71,7 @@ class PathPicker extends StatelessWidget {
                       color: Theme.of(context)
                           .buttonTheme
                           .colorScheme!
-                          .primaryFixedDim,
+                          .primaryFixed,
                     ),
                   ),
                 ),

lib/src/backend/errors/basic.dart

@@ -28,6 +28,7 @@ final class RootAlreadyInitialised extends FMTCBackendError {
 final class StoreNotExists extends FMTCBackendError {
   StoreNotExists({required this.storeName});
 
+  /// The referenced store name
   final String storeName;
 
   @override

lib/src/backend/impls/objectbox/backend/errors.dart

@@ -13,12 +13,10 @@ base class FMTCObjectBoxBackendError extends FMTCBackendError {}
 /// Indicates that an export failed because the specified output path directory
 /// was the same as the root directory
 final class ExportInRootDirectoryForbidden extends FMTCObjectBoxBackendError {
-  ExportInRootDirectoryForbidden({required this.directory});
-
-  final String directory;
+  ExportInRootDirectoryForbidden();
 
   @override
   String toString() =>
       'ExportInRootDirectoryForbidden: It is forbidden to export stores to the '
-      'same directory ($directory) as the `rootDirectory`';
+      'same directory as the `rootDirectory`';
 }

lib/src/backend/impls/objectbox/backend/internal_worker.dart

@@ -863,7 +863,7 @@ Future<void> _worker(
         final outputDir = path.dirname(outputPath);
 
         if (outputDir == input.rootDirectory.absolute.path) {
-          throw ExportInRootDirectoryForbidden(directory: outputDir);
+          throw ExportInRootDirectoryForbidden();
         }
 
         Directory(outputDir).createSync(recursive: true);