implemented comprehensive accessibility (A11y) support across the app

lib/widget/async_actions/async_mixin.dart

@@ -105,10 +105,14 @@ class _InlineErrorWrapper extends StatelessWidget {
             child,
             if (err != null) ...[
               const SizedBox(height: 8),
-              Text(
-                err,
-                textAlign: TextAlign.center,
-                style: _asyncErrorTextStyle(context),
+              Semantics(
+                liveRegion: true,
+                container: true,
+                child: Text(
+                  err,
+                  textAlign: TextAlign.center,
+                  style: _asyncErrorTextStyle(context),
+                ),
               ),
             ],
           ],