quickshell: fix workspace highlight drift and unstable sort

The sliding active indicator positioned itself via Repeater.itemAt(), which
returns null mid-rebuild; the fallback then stranded it at the top (looked
like workspace 1 was active while the font correctly showed another). Cells
are uniform, so compute the indicator's y arithmetically from the index
instead. Also make monitorWsData's sort deterministic: numbered workspaces
ascending, then named ones (e.g. joplin) alphabetically — parseInt alone
yields NaN and an unstable order for named workspaces.

dot_config/quickshell/bar/Workspaces.qml

@@ -31,7 +31,16 @@ Item {
             if (ws.monitor && ws.monitor.name === monitorName)
                 data.push({ id: ws.id, name: ws.name });
         }
-        data.sort((a, b) => parseInt(a.name) - parseInt(b.name));
+        // Numbered workspaces first (ascending), then named ones (e.g. "joplin")
+        // alphabetically. parseInt-only sort is unstable for non-numeric names.
+        data.sort((a, b) => {
+            let na = parseInt(a.name), nb = parseInt(b.name);
+            let aNum = !isNaN(na), bNum = !isNaN(nb);
+            if (aNum && bNum) return na - nb;
+            if (aNum) return -1;
+            if (bNum) return 1;
+            return a.name.localeCompare(b.name);
+        });
         return data;
     }
 
@@ -85,10 +94,11 @@ Item {
                 }
                 return Math.max(0, Math.min(root.activeWsId - 1, root.wsCount - 1));
             }
-            property var targetItem: wsRepeater.itemAt(targetIndex)
-
+            // Position arithmetically from the index — cells are uniform, so this
+            // avoids depending on Repeater.itemAt() (which returns null mid-rebuild
+            // and stranded the indicator at the top).
             x: (container.width - width) / 2
-            y: targetItem ? targetItem.y + wsCol.y : container.padding
+            y: container.padding + targetIndex * (root.cellSize + wsCol.spacing)
             width: root.cellSize
             height: root.cellSize
             radius: Shared.Theme.radiusSmall