updates and bug fixes

lib/widgets/block_progress_bar.dart

@@ -32,6 +32,11 @@ class BlockProgressBar extends StatelessWidget {
     return SizedBox(
       height: height,
       child: Row(
+        // Stretch each cell to the bar's full height. Without this the childless
+        // ColoredBox cells get loose (min-height 0) constraints under the Row's
+        // default center alignment and collapse to zero height — making the whole
+        // bar invisible.
+        crossAxisAlignment: CrossAxisAlignment.stretch,
         children: List.generate(cells, (i) {
           return Expanded(
             child: Padding(