Fix text overflows for long subspace names

lib/widgets/divider_widget.dart

@@ -0,0 +1,25 @@
+import "package:flutter/material.dart";
+
+class DividerWidget extends StatelessWidget {
+  final Widget widget;
+  const DividerWidget(this.widget, {super.key});
+
+  @override
+  Widget build(BuildContext context) => LayoutBuilder(
+    builder: (_, constraints) => Row(
+      children: [
+        SizedBox(
+          width: 16,
+          child: Divider(color: Theme.of(context).colorScheme.onSurface),
+        ),
+        ConstrainedBox(
+          constraints: .new(maxWidth: constraints.maxWidth - 32),
+          child: Padding(padding: const .all(8), child: widget),
+        ),
+        Expanded(
+          child: Divider(color: Theme.of(context).colorScheme.onSurface),
+        ),
+      ],
+    ),
+  );
+}